Switch ensure_packages to ensure_resources for python-memcache

The ensure_packages resource forces ensure to present yielding
duplicate definition errors if we override default Package ensure
to latest. We should solve this by using ensure_resources which
does not enforce this.

Change-Id: I1e2ba2b4a8ab31c925bf31ac1838999fc37b268f
Closes-Bug: #1644906
Resolves: rhbz#1392583

manifests/cache.pp

@@ -156,11 +156,10 @@ define oslo::cache(
       tag    => 'openstack',
     })
   } elsif ($backend =~ /\.memcache/ ) {
-    ensure_packages('python-memcache', {
-      ensure => present,
+    ensure_resources('package', { 'python-memcache' => {
       name   => $::oslo::params::python_memcache_package_name,
       tag    => ['openstack'],
-    })
+    }})
   }
 
   $cache_options = {

spec/defines/oslo_cache_spec.rb

@@ -87,7 +87,6 @@ describe 'oslo::cache' do
       it 'configures cache backend' do
         is_expected.to contain_keystone_config('cache/backend').with_value('dogpile.cache.memcache')
         is_expected.to contain_package('python-memcache').with(
-          :ensure => 'present',
           :name   => platform_params[:python_memcache_package_name],
           :tag    => ['openstack'],
         )