parser: add parser support for message queue mediation

Message queue rules take the following format:

	mqueue [<access_mode>] [<type>] [<label>] [<mqueue name>],
	access_mode := 'r'|'w'|'rw'|'read'|'write'|
		       'create'|'open'|'delete'|
		       'getattr'|'setattr'
	type := 'type' '=' ('posix'|'sysv')
	label := 'label' '=' <target label>

Signed-off-by: Georgia Garcia <georgia.garcia@canonical.com>
Signed-off-by: John Johansen <john.johansen@canonical.com>

parser/parser_misc.c

@@ -121,6 +121,9 @@ static struct keyword_table keyword_table[] = {
 	{"readby",		TOK_READBY},
 	{"abi",			TOK_ABI},
 	{"userns",		TOK_USERNS},
+	{"mqueue",		TOK_MQUEUE},
+	{"delete",		TOK_DELETE},
+	{"open",		TOK_OPEN},
 
 	/* terminate */
 	{NULL, 0}