ctld(8) doesn't require -lcam or -lssl; remove those from DPADD and LDADD.

MFC after:	1 month
Sponsored by:	The FreeBSD Foundation
Improve wording in ctl.conf(5).

Differential Revision:	https://reviews.freebsd.org/D1020
Reviewed by:	bcr@ (earlier version), wblock@
MFC after:	1 month
Sponsored by:	The FreeBSD Foundation