Print commas in the group list in user().  current() already did this.
Print commas in the group list in user().  current() already did this.

Reviewed by:	ru, sheldonh
Inspired by:	OpenBSD, NetBSD

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase