Make comconsole options set before its activation to be remembered.

MFC after:	2 weeks
Sponsored by:	iXsystems, Inc.
Document r260582.

Sponsored by:	The FreeBSD Foundation
Document r260552.

Sponsored by:	The FreeBSD Foundation
Document r260532.

Sponsored by:	The FreeBSD Foundation
Style(9) fix.
No functional changes.

Sponsored by:	The FreeBSD Foundation