selftests: add mq_open_tests

Add a directory to house POSIX message queue subsystem specific tests.
Add first test which checks the operation of mq_open() under various
corner conditions.
Signed-off-by: Doug Ledford <dledford@redhat.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Doug Ledford <dledford@redhat.com>
Cc: Joe Korty <joe.korty@ccur.com>
Cc: Amerigo Wang <amwang@redhat.com>
Cc: Serge E. Hallyn <serue@us.ibm.com>
Cc: Jiri Slaby <jslaby@suse.cz>
Cc: Manfred Spraul <manfred@colorfullife.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

tools/testing/selftests/Makefile

-TARGETS = breakpoints vm
+TARGETS = breakpoints mqueue vm
 
 all:
 	for TARGET in $(TARGETS); do \

tools/testing/selftests/mqueue/Makefile

+all:
+	gcc -O2 -lrt mq_open_tests.c -o mq_open_tests
+
+run_tests:
+	./mq_open_tests /test1
+
+clean:
+	rm -f mq_open_tests