ima: ignore suffixed policy rule comments

Lines beginning with '#' in the IMA policy are comments and are ignored.
Instead of placing the rule and comment on separate lines, allow the
comment to be suffixed to the IMA policy rule.

Reviewed-by: Petr Vorel <pvorel@suse.cz>
Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org>
Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>