Description of Problem:
If you have two identical groups in a group file and run grpconv on the
file, grpconv will run the system out of resources until the VM steps
in and kills grpconv.
Grant it, you should _never_ have two identical groups in a group file, but
shit does happen in the real world, especially when you are piecing a
system back together from backups.
Give me a core dump or an exit -1 rather than an infinite loop that brings
the system to its knees please.
'till the cows come home.
Steps to Reproduce:
1. edit the group file, duplicate an entry. Any entry should do.
2. run grpconv
3) Watch the system grind to a crawl. Try running top if you want.
This is still an issue in current phoebe