zdtm: up the loopback device in a new network namespace

In this case we can run more tests
Signed-off-by: Andrew Vagin <avagin@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

test/zdtm.py

@@ -1275,7 +1275,10 @@ def run_tests(opts):
 		opts['parallel'] = None
 
 	if opts['join_ns']:
-		subprocess.Popen(["ip", "netns", "add", "zdtm_netns"])
+		if subprocess.Popen(["ip", "netns", "add", "zdtm_netns"]).wait():
+                    raise Exception("Unable to create a network namespace")
+		if subprocess.Popen(["ip", "netns", "exec", "zdtm_netns", "ip", "link", "set", "up", "dev", "lo"]).wait():
+                    raise Exception("ip link set up dev lo")
 
 	l = launcher(opts, len(torun))
 	try:

test/zdtm/static/packet_sock.desc

-{'flags': 'suid samens'}
+{'flags': 'suid'}

test/zdtm/static/socket_udp.desc

-{'flags': 'samens'}

test/zdtm/static/socket_udplite.desc

-{'flags': 'samens'}