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)

Fix a problem with high CPU consumption (up to 30%) by bsnmpd on a loaded system.
Instead of constantly calling the mibII_idle function when the server is not busy
call the function only once every 10 seconds to avoid bsnmpd constantly doing
gettimeofday syscalls. Make the idle polling interval confugurable via
begemotIfDataPoll.

Reported and tested by: misho (at) aitbg (dot) com
Oked by: harti
MFC after: 1 week

This commit was generated by cvs2svn to compensate for changes in r156066,
which included commits to RCS files with non-trunk default branches.

Virgin import of bsnmpd 1.12