fix(libsinsp): allow reading scap from stdin

[therealbobo]

What type of PR is this?

Uncomment one (or more) /kind <> lines:

/kind bug

/kind cleanup

/kind design

/kind documentation

/kind failing-test

/kind feature

Any specific area of the project related to this PR?

Uncomment one (or more) /area <> lines:

/area API-version

/area build

/area CI

/area driver-kmod

/area driver-bpf

/area driver-modern-bpf

/area libscap-engine-bpf

/area libscap-engine-gvisor

/area libscap-engine-kmod

/area libscap-engine-modern-bpf

/area libscap-engine-nodriver

/area libscap-engine-noop

/area libscap-engine-source-plugin

/area libscap-engine-savefile

/area libscap

/area libpman

/area libsinsp

/area tests

/area proposals

Does this PR require a change in the driver versions?

/version driver-API-version-major

/version driver-API-version-minor

/version driver-API-version-patch

/version driver-SCHEMA-version-major

/version driver-SCHEMA-version-minor

/version driver-SCHEMA-version-patch

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

[github-actions]

Perf diff from master - unit tests

     9.54%     +3.14%  [.] sinsp_parser::reset
     1.20%     +1.93%  [.] sinsp::fetch_next_event
     9.10%     -1.08%  [.] sinsp_evt::get_type
     5.72%     -0.83%  [.] next_event_from_file
     1.25%     +0.64%  [.] libsinsp::sinsp_suppress::process_event
     0.52%     +0.59%  [.] scap_next
    11.01%     -0.54%  [.] sinsp::next
     3.95%     -0.51%  [.] gzfile_read
     2.15%     -0.44%  [.] std::_Hashtable<long, std::pair<long const, std::shared_ptr<sinsp_threadinfo> >, std::allocator<std::pair<long const, std::shared_ptr<sinsp_threadinfo> > >, std::__detail::_Select1st, std::equal_to<long>, std::hash<long>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, false, true> >::_M_find_before_node
     0.75%     +0.38%  [.] sinsp_evt::get_direction

Heap diff from master - unit tests

peak heap memory consumption: 0B
peak RSS (including heaptrack overhead): 0B
total memory leaked: 0B

Heap diff from master - scap file

peak heap memory consumption: 0B
peak RSS (including heaptrack overhead): 0B
total memory leaked: 0B

Benchmarks diff from master

Comparing gbench_data.json to /root/actions-runner/_work/libs/libs/build/gbench_data.json
Benchmark                                                         Time             CPU      Time Old      Time New       CPU Old       CPU New
----------------------------------------------------------------------------------------------------------------------------------------------
BM_sinsp_split_mean                                            -0.0296         -0.0295           153           148           153           148
BM_sinsp_split_median                                          -0.0303         -0.0302           152           148           152           148
BM_sinsp_split_stddev                                          +0.4224         +0.4205             1             1             1             1
BM_sinsp_split_cv                                              +0.4658         +0.4637             0             0             0             0
BM_sinsp_concatenate_paths_relative_path_mean                  -0.0859         -0.0858            61            56            61            56
BM_sinsp_concatenate_paths_relative_path_median                -0.0874         -0.0873            61            56            61            56
BM_sinsp_concatenate_paths_relative_path_stddev                +0.5641         +0.5651             0             0             0             0
BM_sinsp_concatenate_paths_relative_path_cv                    +0.7110         +0.7120             0             0             0             0
BM_sinsp_concatenate_paths_empty_path_mean                     -0.0509         -0.0509            25            24            25            24
BM_sinsp_concatenate_paths_empty_path_median                   -0.0481         -0.0480            25            24            25            24
BM_sinsp_concatenate_paths_empty_path_stddev                   -0.7027         -0.7018             0             0             0             0
BM_sinsp_concatenate_paths_empty_path_cv                       -0.6867         -0.6858             0             0             0             0
BM_sinsp_concatenate_paths_absolute_path_mean                  -0.1057         -0.1056            63            56            63            56
BM_sinsp_concatenate_paths_absolute_path_median                -0.1005         -0.1004            62            56            62            56
BM_sinsp_concatenate_paths_absolute_path_stddev                -0.6113         -0.6114             1             0             1             0
BM_sinsp_concatenate_paths_absolute_path_cv                    -0.5654         -0.5655             0             0             0             0
BM_sinsp_split_container_image_mean                            -0.0208         -0.0207           404           395           403           395
BM_sinsp_split_container_image_median                          -0.0209         -0.0208           404           396           404           396
BM_sinsp_split_container_image_stddev                          +0.3118         +0.3105             2             3             2             3
BM_sinsp_split_container_image_cv                              +0.3397         +0.3383             0             0             0             0

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.12%. Comparing base (cb93f4b) to head (696b880).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2241   +/-   ##
=======================================
  Coverage   75.11%   75.12%           
=======================================
  Files         276      276           
  Lines       34394    34400    +6     
  Branches     5922     5921    -1     
=======================================
+ Hits        25836    25843    +7     
+ Misses       8558     8557    -1     

Flag	Coverage Δ
libsinsp	75.12% <100.00%> (+<0.01%)	⬆️

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[FedeDP]

/approve

[poiana]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: FedeDP, therealbobo

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[poiana]

LGTM label has been added.

Git tree hash: 9af7085c5ce554a0555d47de20b7fd6c1d65cfee

[FedeDP]

/milestone 0.20.0