world readable initscripts are a security vulnerability

[robert-bo-davis]

This is similar to the problem addressed by 8fa788b. The initscripts created by docker::run() are world readable/executable by default which exposes potentially sensitive env variables to any authenticated system user.

Setting their owner to "root:${docker::params::docker_group}" and mode to '0750' or '0640' depending on the type of file should resolve this problem. I am happy to submit a PR with these changes if you think that is an acceptable way to mitigate the problem.

[scotty-c]

@mujiburger If you could submit a PR with your suggested changes it would be greatly appreciated.