Log Message:
Update to 3.15.2

Upstream changes:
3.15.2:
        - 'if' constraint now works in combination with class contexts
          (CFE-2615)
        - Fixed rare crashing bug when parsing zombie entries in ps
          output. The problem was only ever observed on AIX, but could
          theoretically happen on any platform depending on exact libc behavior.
          (ENT-5329)
        - Fixed ifelse() to return fallback in case of unresolved variables
          (ENT-4653)
        - Fixed service status cfengine3 on systemd managed hosts (ENT-5528)
        - Improved management of secondary groups to avoid intermediary state \ 
failures
          (ENT-3710)