MFC v1.78 and v1.79: Remove process limits for datasize and stacksize which are unlimited during a "normal login" (thanks to /etc/login.conf) but not when sysinstall is running as part of an installation.  Fixups for error messages and a comment that became untrue.
MFC v1.78 and v1.79:
Remove process limits for datasize and stacksize which are unlimited
during a "normal login" (thanks to /etc/login.conf) but not when
sysinstall is running as part of an installation.  Fixups for error
messages and a comment that became untrue.

Approved by:	 re (bmah)

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