Enable caching in more services

This enables caching using oslo.cache in the following services, to
test the related deployment logics.

- ec2-api
- neutron
- watcher
- zaqar

Change-Id: Ia58a85701107bab747e0f33133486e63be54a0a9

manifests/ec2api.pp

@@ -29,6 +29,11 @@ class openstack_integration::ec2api {
 
   case $facts['os']['family'] {
     'RedHat': {
+      class { 'ec2api::cache':
+        backend          => 'dogpile.cache.pymemcache',
+        enabled          => true,
+        memcache_servers => $::openstack_integration::config::memcache_servers,
+      }
       class { 'ec2api::db':
         database_connection => os_database_connection({
           'dialect'  => 'mysql+pymysql',

manifests/neutron.pp

@@ -257,6 +257,11 @@ class openstack_integration::neutron (
     Anchor['neutron::service::end'] ~> Exec['check-neutron-server'] -> Neutron_network<||>
   }
 
+  class { 'neutron::cache':
+    backend          => 'dogpile.cache.pymemcache',
+    enabled          => true,
+    memcache_servers => $::openstack_integration::config::memcache_servers,
+  }
   class { 'neutron::db':
     database_connection => os_database_connection({
       'dialect'  => 'mysql+pymysql',

manifests/watcher.pp

@@ -21,6 +21,11 @@ class openstack_integration::watcher {
     password => 'watcher',
     host     => $::openstack_integration::config::host,
   }
+  class { 'watcher::cache':
+    backend          => 'dogpile.cache.pymemcache',
+    enabled          => true,
+    memcache_servers => $::openstack_integration::config::memcache_servers,
+  }
   class { 'watcher::db':
     database_connection => os_database_connection({
       'dialect'  => 'mysql+pymysql',

manifests/zaqar.pp

@@ -34,6 +34,11 @@ class openstack_integration::zaqar {
     auth_url => "${::openstack_integration::config::keystone_auth_uri}/v3",
     password => 'a_big_secret'
   }
+  class { 'zaqar::cache':
+    backend          => 'dogpile.cache.pymemcache',
+    enabled          => true,
+    memcache_servers => $::openstack_integration::config::memcache_servers,
+  }
   class { 'zaqar::management::sqlalchemy':
     uri => os_database_connection({
       'dialect'  => 'mysql+pymysql',