Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by: re (implicit)

The size of credential messages is limited by CMGROUP_MAX rather than
NGROUPS.

MFC after: 1 week

This commit was generated by cvs2svn to compensate for changes in r178825,
which included commits to RCS files with non-trunk default branches.