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 to those scripts that start persistent services
to allow them to do a "clean" shutdown.

I purposely avoided making changes to network-related stuff since the
system shutting down is pretty conclusive, and there may be complicated
dependencies on the network that I would rather not try to unravel.

I also skipped kerberos-related stuff for the reasons above, and
because I have no way to test it.

As previously discussed, add the svn:executable property to all scripts

Use $required_modules wherever suitable. Use load_kld() in special
cases. So we get rid of quite a few lines of duplicated code.

Remove not needed redirection of kldstat -q output to /dev/null.

Noticed by: pjd
MFC after: 3 days

Revise hcsecd(8) and sdpd(8) rc.d scripts one more time

- Use _prestart rc.d method to automatically kldload ng_btsocket(4) if needed;

- Rename "sdpd_user" to "sdpd_username" and "sdpd_group" to "sdpd_groupname"
to avoid collision with "magic" variables;

Inspired by: yar
MFC after: 3 days

Revise hcsecd(8) and sdpd(8) rc.d scripts.

- Have both scripts automatically kldload ng_btsocket(4). I did not want to
do it, but its easier for users and it seems other scripts do similar things;

- Assign few variables after load_rc_config, so the /etc/rc.conf overrides
actually work;

MFC after: 1 week

Add rc.d scripts for the hcsecd(8) and sdpd(8) daemons. Put defaults into
/etc/defaults/rc.conf. Both daemons can run even if no Bluetooth devices
are attached to the system. Both daemons depend on Bluetooth socket layer
and thus disabled by default. Bluetooth sockets layer must be either loaded
as a module or compiled into kernel before the daemons can run.

MFC after: 1 month