Fixes #4865: Correct check_rudder_agent not to use init.d on AIX and optimise os family detection (call uname only one time)
Merge pull request #324 from Kegeruneku/bug_4865/dev/4865_fix_check_rudder_agent_script_aix_incompatibility

Fixes #4865: Correct check_rudder_agent not to use init.d on AIX and opt...
Merge branch 'branches/rudder/2.10'