Fix for Preforce utility does not check if p4 command exists
Check for exit code is equal to 0 instead of 127
Changes comparsion to strict and removed a comment
Removed unnecessary test and just check for return code
non-deep check returns allways false
Merge remote-tracking branch 'fabiang/preforce'
Minor tweaks to perforce support, refs #2329
Merge remote-tracking branch 'origin/master'