Fix MUnit error parsing

Fix the CommonFunctions.cmake code that parses the MUnit output for error
reporting.  It assumed that the all MUnit routines would start with ZZUT which
is not the case.

Remove the "ZZUT" from the regex matches while changing the failure
message line to check for the captured routine_name.

Add comments to describe each if statment.

OSEHRA-Id: http://issues.osehra.org/browse/OAT-112
Change-Id: I1f71123b83825e6e47bc7659be42936409671393
Merge "Fix MUnit error parsing"