shmctl/shmctl01.c: cleanup

1. Remove useless comments

2. Revise code to follow ltp-code-style

Signed-off-by: DAN LI <li.dan@cn.fujitsu.com>
Reviewed-by: Jan Stancek <jstancek@redhat.com>
Signed-off-by: Wanlong Gao <gaowanlong@cn.fujitsu.com>
shmctl/shmctl01.c: Test features IPC_INFO, SHM_STAT, SHM_LOCK and SHM_UNLOCK.

Additional tests for features IPC_INFO, SHM_STAT, SHM_LOCK and SHM_UNLOCK.

Signed-off-by: DAN LI <li.dan@cn.fujitsu.com>
Reviewed-by: Jan Stancek <jstancek@redhat.com>
Signed-off-by: Wanlong Gao <gaowanlong@cn.fujitsu.com>