zdtm: add nftables network namespace locking test

This is just a symlink to the original static/netns_lock test with
the right options passed to use nftables instead.

v2:
	- make static/netns_lock test iptables explicitly
	- prevent netns_lock tests from running in parallel because
	  netns & sync files creation were conflicting in both tests.

Signed-off-by: Zeyad Yasser <zeyady98@gmail.com>

test/zdtm/static/Makefile

@@ -217,7 +217,8 @@ TST_NOFILE	:=				\
 		uffd-events			\
 		thread_different_uid_gid	\
 		pipe03				\
-		netns_lock			\
+		netns_lock_iptables			\
+		netns_lock_nftables			\
 		netns_sub			\
 		netns_sub_veth			\
 		netns_sub_sysctl	\

test/zdtm/static/netns_lock_iptables.desc

@@ -1,6 +1,6 @@
 {
     'flavor': 'h',
-    'flags': 'suid',
-    'opts': '--tcp-established',
+    'flags': 'suid excl',
+    'opts': '--tcp-established --network-lock iptables',
     'ropts': '--join-ns net:/var/run/netns/criu-net-lock-test'
 }

test/zdtm/static/netns_lock_nftables.c

@@ -0,0 +1 @@
+netns_lock_iptables.c

test/zdtm/static/netns_lock_nftables.desc

@@ -0,0 +1,7 @@
+{
+    'flavor': 'h',
+    'flags': 'suid excl',
+    'feature': 'network_lock_nftables',
+    'opts': '--tcp-established --network-lock nftables',
+    'ropts': '--join-ns net:/var/run/netns/criu-net-lock-test'
+}

test/zdtm/static/netns_lock_nftables.hook

@@ -0,0 +1 @@
+netns_lock_iptables.hook