Added timeout option

[j-baines]

See #106

Before:

albinolobster@mournland:~/initial-access/feed/cve-2021-1473$ ./build/cve-2021-1473_linux-arm64 -v -rhost 8.8.8.8 -rport 5
time=2024-03-21T17:00:55.561-04:00 level=STATUS msg="Starting target" index=0 host=8.8.8.8 port=5 ssl=false "ssl auto"=false
time=2024-03-21T17:00:55.562-04:00 level=STATUS msg="Validating Cisco RV340/RV345 target" host=8.8.8.8 port=5
time=2024-03-21T17:01:05.565-04:00 level=ERROR msg="HTTP request error: Get \"http://8.8.8.8:5/\": context deadline exceeded (Client.Timeout exceeded while awaiting headers)"
time=2024-03-21T17:01:05.565-04:00 level=ERROR msg="The target isn't recognized as Cisco RV340/RV345, quitting" host=8.8.8.8 port=5 verified=false

After:

albinolobster@mournland:~/initial-access/feed/cve-2021-1473$ ./build/cve-2021-1473_linux-arm64 -v -rhost 8.8.8.8 -rport 5 -timeout 30
time=2024-03-21T17:03:37.754-04:00 level=STATUS msg="Starting target" index=0 host=8.8.8.8 port=5 ssl=false "ssl auto"=false
time=2024-03-21T17:03:37.754-04:00 level=STATUS msg="Validating Cisco RV340/RV345 target" host=8.8.8.8 port=5
time=2024-03-21T17:04:07.782-04:00 level=ERROR msg="HTTP request error: Get \"http://8.8.8.8:5/\": context deadline exceeded (Client.Timeout exceeded while awaiting headers)"
time=2024-03-21T17:04:07.782-04:00 level=ERROR msg="The target isn't recognized as Cisco RV340/RV345, quitting" host=8.8.8.8 port=5 verified=false

albinolobster@mournland:~/initial-access/feed/cve-2021-1473$ ./build/cve-2021-1473_linux-arm64 -v -rhost 8.8.8.8 -rport 5 -timeout 60
time=2024-03-21T17:15:25.376-04:00 level=STATUS msg="Starting target" index=0 host=8.8.8.8 port=5 ssl=false "ssl auto"=false
time=2024-03-21T17:15:25.376-04:00 level=STATUS msg="Validating Cisco RV340/RV345 target" host=8.8.8.8 port=5
time=2024-03-21T17:16:25.438-04:00 level=ERROR msg="HTTP request error: Get \"http://8.8.8.8:5/\": context deadline exceeded (Client.Timeout exceeded while awaiting headers)"
time=2024-03-21T17:16:25.438-04:00 level=ERROR msg="The target isn't recognized as Cisco RV340/RV345, quitting" host=8.8.8.8 port=5 verified=false