Post::Windows::Service: Support start/stop service on shell sessions

[bcoles]

Tested regex on a few Windows systems with different localizations. Regex worked on all.

Sample test code:

  def check
    puts service_start('dhcp', '127.0.0.2').to_s      # already started
    puts service_start('asdf', '127.0.0.2').to_s      # does not exist

    puts service_start('wmiApSrv', '127.0.0.2').to_s  # start...
    puts service_stop('wmiApSrv', '127.0.0.2').to_s   # ...then stop

    puts service_stop('asdf', '127.0.0.2').to_s       # does not exist
    CheckCode::Unknown
  end

Will not work on Windows 2000 systems (and earlier) as sc.exe does not exist.

[bwatters-r7]

Hey there; I don't want you to think I've forgotten this. I was working to add a couple more updates to get both Meterpreter and shell sessions to work with the post/test/services module. I've had varying success, but I'm working on it on and off, so it may be a bit longer as I work it out.

[bwatters-r7]

Release Notes

This PR adds support for starting and stopping Windows services using the service control manager to shell payloads.