Add support for keystoneclient 0.4.0

Keystoneclient auth_middleware changed the way it parses the datetime
returned from the cache, breaking the Ceilometer unit tests. This patch
fixes the fake cache system that's used in unit test, so it works with
all keystoneclient versions.

This also update the sample configuration files to include the new
options provided by keystoneclient 0.4.0.

Fixes-Bug: #1238529

Change-Id: Iecfd50d9e9801aeb919f2c09a728e4ea15245a5e
(cherry picked from commit e3cef87)

etc/ceilometer/ceilometer.conf.sample

@@ -742,6 +742,10 @@
 # server. (boolean value)
 #http_connect_timeout=<None>
 
+# How many times are we trying to reconnect when communicating
+# with Identity API Server. (integer value)
+#http_request_max_retries=3
+
 # Allows to pass in the name of a fake http_handler callback
 # function used instead of httplib.HTTPConnection or
 # httplib.HTTPSConnection. Useful for unit testing where
@@ -774,6 +778,13 @@
 # (string value)
 #keyfile=<None>
 
+# A PEM encoded Certificate Authority to use when verifying
+# HTTPs connections. Defaults to system CAs. (string value)
+#cafile=<None>
+
+# Verify HTTPS connections. (boolean value)
+#insecure=false
+
 # Directory used to cache files related to PKI tokens (string
 # value)
 #signing_dir=<None>

tests/api/v2/test_acl_scenarios.py

@@ -27,6 +27,7 @@
 from ceilometer.api import acl
 from ceilometer.publisher import rpc
 from ceilometer.tests import db as tests_db
+from ceilometer.openstack.common import timeutils
 
 from .base import FunctionalTest
 
@@ -37,12 +38,8 @@
 
 
 class FakeMemcache(object):
-    def __init__(self):
-        self.set_key = None
-        self.set_value = None
-        self.token_expiration = None
-
-    def get(self, key):
+    @staticmethod
+    def get(key):
         if key == "tokens/%s" % VALID_TOKEN:
             dt = datetime.datetime.now() + datetime.timedelta(minutes=5)
             return json.dumps(({'access': {
@@ -55,7 +52,7 @@ def get(self, key):
                     'roles': [
                         {'name': 'admin'},
                     ]},
-            }}, dt.strftime("%s")))
+            }}, timeutils.isotime(dt)))
         if key == "tokens/%s" % VALID_TOKEN2:
             dt = datetime.datetime.now() + datetime.timedelta(minutes=5)
             return json.dumps(({'access': {
@@ -68,11 +65,11 @@ def get(self, key):
                     'roles': [
                         {'name': 'Member'},
                     ]},
-            }}, dt.strftime("%s")))
+            }}, timeutils.isotime(dt)))
 
-    def set(self, key, value, **kwargs):
-        self.set_value = value
-        self.set_key = key
+    @staticmethod
+    def set(key, value, **kwargs):
+        pass
 
 
 class TestAPIACL(FunctionalTest,