Fixes #4694: RPM postinst fails on all systems due to missing directories - but do mkdir them first
Merge pull request #292 from jooooooon/bug_4691/rpm_postinst_fails_on_aix_due_to_use_of_uuidgen

Fixes #4694: RPM postinst fails on all systems due to missing directorie...
Fixes #4695: On AIX, check-rudder-agent script complains uses nonexistant options for ps and echo