Add decorator to mark unstable tests

As is done in the neutron repo, add a decorator to mark
tests as unstable so that we can work in parallel on
fixing them while having the job pass.

Mark the DVR east-west tests as unstable to prove it works.

Change-Id: I15fcdcba681d40c96f9f79aaa21881bc45fe3066
Related-bug: #1717302

neutron_tempest_plugin/common/utils.py

@@ -19,6 +19,7 @@
 """Utilities and helper functions."""
 
 import eventlet
+import functools
 import threading
 import time
 
@@ -70,3 +71,19 @@ def wait_until_true(predicate, timeout=60, sleep=1, exception=None):
             #pylint: disable=raising-bad-type
             raise exception
         raise WaitTimeout("Timed out after %d seconds" % timeout)
+
+
+# TODO(haleyb): move to neutron-lib
+# code copied from neutron repository - neutron/tests/base.py
+def unstable_test(reason):
+    def decor(f):
+        @functools.wraps(f)
+        def inner(self, *args, **kwargs):
+            try:
+                return f(self, *args, **kwargs)
+            except Exception as e:
+                msg = ("%s was marked as unstable because of %s, "
+                       "failure was: %s") % (self.id(), reason, e)
+                raise self.skipTest(msg)
+        return inner
+    return decor

neutron_tempest_plugin/scenario/test_floatingip.py

@@ -22,6 +22,7 @@ import testscenarios
 from testscenarios.scenarios import multiply_scenarios
 
 from neutron_tempest_plugin.common import ssh
+from neutron_tempest_plugin.common import utils as common_utils
 from neutron_tempest_plugin import config
 from neutron_tempest_plugin.scenario import base
 from neutron_tempest_plugin.scenario import constants
@@ -134,6 +135,7 @@ class FloatingIpSameNetwork(FloatingIpTestCasesMixin,
 
     same_network = True
 
+    @common_utils.unstable_test("bug 1717302")
     @decorators.idempotent_id('05c4e3b3-7319-4052-90ad-e8916436c23b')
     def test_east_west(self):
         self._test_east_west()
@@ -151,6 +153,7 @@ class FloatingIpSeparateNetwork(FloatingIpTestCasesMixin,
 
     same_network = False
 
+    @common_utils.unstable_test("bug 1717302")
     @decorators.idempotent_id('f18f0090-3289-4783-b956-a0f8ac511e8b')
     def test_east_west(self):
         self._test_east_west()