Fix automountd(8) not to leave zombies.

MFC after:	1 month
Sponsored by:	The FreeBSD Foundation
Implement more functional CTL debug logging.

Setting bits in kern.cam.ctl.debug allows to log errors, commands and some
commands data respectively.

MFC after:	1 week
When removing an iSCSI session, check whether all conditions match,
not if any of them matches.  This fixes "iscsictl -Rn" removing
unrelated sessions.

PR:		194034
MFC after:	1 month
Sponsored by:	The FreeBSD Foundation