Limit memcached to 50% of RAM instead of 95%

memcached allocates too much RAM as under heavy load conditions.
memcached should not grow higher than 50% of RAM. OOM may kill the
process when server run out of free RAM.

Change-Id: I9b4b0597bcc3e5aadb7905e16ac160d5bebfd00d
Closes-Bug: 1439882
Signed-off-by: Sergii Golovatiuk <sgolovatiuk@mirantis.com>

deployment/puppet/openstack/manifests/horizon.pp

@@ -43,11 +43,6 @@ class openstack::horizon (
   $servername              = $::hostname,
 ) {
 
-  # class { 'memcached':
-  #  listen_ip => $cache_server_ip,
-  #  tcp_port  => $cache_server_port,
-  #  udp_port  => $cache_server_port,
-  # }
   if $debug { #syslog and nondebug case
     #We don't realy want django debug, it is too verbose.
     $django_debug   = false

deployment/puppet/osnailyfacter/modular/memcached/memcached.pp

@@ -1,4 +1,5 @@
 notice('MODULAR: memcached.pp')
 class { 'memcached':
-  listen_ip => hiera('internal_address'),
+  listen_ip  => hiera('internal_address'),
+  max_memory => '50%',
 }