add OCFS2_LOCK_RECURSIVE arg_flags to ocfs2_cluster_lock() to prevent hang

add OCFS2_LOCK_RECURSIVE arg_flags to ocfs2_cluster_lock() to prevent hang

Orabug: 21793017

ocfs2_setattr called by chmod command  holds cluster wide inode lock
(Orabug 21685187) when calling posix_acl_chmod. This
latter function in turn calls ocfs2_iop_get_acl and ocfs2_iop_set_acl.
These two are also called directly from vfs layer for getfacl/setfacl
commands and therefore acquire the cluster wide inode lock. If a remote
conversion request comes after the first inode lock in ocfs2_setattr,
OCFS2_LOCK_BLOCKED will be set in l_flags. This will cause the second
call to inode lock from the  ocfs2_iop_get|set_acl() to block indefinetly.
The new flag OCFS2_LOCK_RECURSIVE will be used to prevent this blocking.

Signed-off-by: Tariq Saeed <tariq.x.saeed@oracle.com>
Signed-off-by: Junxiao Bi <junxiao.bi@oracle.com>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>