The 'forcemand' form of 'forcemandatorylock' mount option was missed
when the code moved to use the standard token parser. Return it back.

Also fix a comment style in the parser.
Signed-off-by: NPavel Shilovsky <piastry@etersoft.ru>
Reviewed-by: NJeff Layton <jlayton@redhat.com>
Signed-off-by: NSteve French <sfrench@us.ibm.com>