Fix ZPL miswrite of default POSIX ACL

BugLink: http://bugs.launchpad.net/bugs/1574801

Commit 4967a3e introduced a typo that caused the ZPL to store the
intended default ACL as an access ACL. Due to caching this problem
may not become visible until the filesystem is remounted or the inode
is evicted from the cache. Fix the typo and add a regression test.
Signed-off-by: Ned Bass <bass6@llnl.gov>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Chunwei Chen <tuxoko@gmail.com>
Closes #4520
(backport from 98f03691a4c08f38ca4538c468e9523f8e6b24be https://github.com/zfsonlinux/zfs.git)
(dropped redundant modifications to zfs tests, we don't have these)
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Acked-by: Tim Gardner <tim.gardner@canonical.com>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>

zfs/module/zfs/zpl_xattr.c

@@ -969,7 +969,7 @@ zpl_set_acl(struct inode *ip, int type, struct posix_acl *acl)
 		break;
 
 	case ACL_TYPE_DEFAULT:
-		name = XATTR_NAME_POSIX_ACL_ACCESS;
+		name = XATTR_NAME_POSIX_ACL_DEFAULT;
 		if (!S_ISDIR(ip->i_mode))
 			return (acl ? -EACCES : 0);
 		break;