Cross-reference automount(8) from mount(8).

MFC after:	1 month
Sponsored by:	The FreeBSD Foundation
Cross-reference autounmountd(8) from umount(8).

MFC after:	1 month
Sponsored by:	The FreeBSD Foundation
Implement "automount -c".

MFC after:	1 month
Sponsored by:	The FreeBSD Foundation