Skip failing integration tests

Some tests are failing because ec2tokens seems broken. Let's skip them
for now.

Ref bug #1484086

Change-Id: I7de260e4dbd1c17fddc9385bdbb127fd593441be
diff --git a/scenario/test_server_cfn_init.py b/scenario/test_server_cfn_init.py
index 267b44b..00a360b 100644
--- a/scenario/test_server_cfn_init.py
+++ b/scenario/test_server_cfn_init.py
@@ -12,6 +12,8 @@
 
 import json
 
+from testtools import testcase
+
 from heat_integrationtests.common import exceptions
 from heat_integrationtests.scenario import scenario_base
 
@@ -93,6 +95,7 @@
                 self._log_console_output(servers=[server])
                 raise e
 
+    @testcase.skip('Skipped until keystone fixed #1484086')
     def test_server_cfn_init(self):
         """
         Check cfn-init and cfn-signal availability on the created server.