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

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

MFC r230099:

Change rcvar= assignments to the literal values set_rcvar
would have returned. This will slightly reduce boot time,
and help in diff reduction to HEAD.

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

Approved by: re (implicit)

Add the shutdown KEYWORD.

Pointed out by: dougb
MFC after: 3 days

Add rc.d script for the rtsold(8) daemon.

The rtsol(8) handles just one RA then exit. So, the OtherConfig flag
may not be handled well by rtsol(8) in the environment where there are
multiple RA servers on the segment. In such case, rtsold(8) will be
your friend.

Reviewed by: hrs
MFC after: 2 weeks