zdtm: skip 'tcp-close' tests if restore is skipped

'tcp-close' is a option that replaces connected tcp-sockets with
'closed' ones during restoring, therefore it have no sense without
restore stage. Thus let's skip related tests if the 'norst' flag was
specified.
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>

test/zdtm.py

@@ -1643,6 +1643,10 @@ def run_tests(opts):
 				l.skip(t, "arch %s" % tdesc['arch'])
 				continue
 
+			if test_flag(tdesc, 'reqrst') and opts['norst']:
+				l.skip(t, "restore stage is required")
+				continue
+
 			if run_all and test_flag(tdesc, 'noauto'):
 				l.skip(t, "manual run only")
 				continue

test/zdtm/static/socket-tcp-close0.desc

-{'dopts': '--tcp-established', 'ropts': '--tcp-close'}
+{'dopts': '--tcp-established', 'ropts': '--tcp-close', 'flags': 'reqrst '}