Adds Support for a Configuring Memcached

Previously, the memcached listen ip was hard-coded to '127.0.0.1'.
This does not allow users to bind memcached to a routable IP
address.  This is needed to allow memcached to service remote
requests.

The change introduces the memcached_listen_ip and
swift_memcache_servers parameters.  memcached_listen_ip allows
users to specify an IP address for memcached to listen on.
swift_memcache_servers specifies a list (ip:port) of memcached
servers that can be used by the Swift proxy cache service.

Defaults to '127.0.0.1' for backwards compatibility and to have
memcached only listen to local requests (loopback address).

Change-Id: I4287b9a165b5aae4568334b7b97f1bf40696c2f5

manifests/swift/proxy.pp

@@ -20,7 +20,9 @@ class openstack::swift::proxy (
   $package_ensure                   = 'present',
   $controller_node_address          = '10.0.0.1',
   $keystone_host                    = '10.0.0.1',
-  $memcached                        = true
+  $memcached                        = true,
+  $swift_memcache_servers           = ['127.0.0.1:11211'],
+  $memcached_listen_ip              = '127.0.0.1'
 ) {
 
   if $controller_node_address !='10.0.0.1' {
@@ -36,7 +38,7 @@ class openstack::swift::proxy (
 
   if $memcached {
     class { 'memcached':
-      listen_ip => '127.0.0.1',
+      listen_ip => $memcached_listen_ip,
     }
   }
 
@@ -55,10 +57,13 @@ class openstack::swift::proxy (
   class { [
     '::swift::proxy::catch_errors',
     '::swift::proxy::healthcheck',
-    '::swift::proxy::cache',
     '::swift::proxy::swift3',
   ]: }
 
+  class { 'swift::proxy::cache':
+    memcache_servers => $swift_memcache_servers,
+  }
+
   class { '::swift::proxy::ratelimit':
     clock_accuracy         => $ratelimit_clock_accuracy,
     max_sleep_time_seconds => $ratelimit_max_sleep_time_seconds,