Add apache2-utils package to api server

This commit adds the missing apache2-utils package to the api server.
The apache2 startup (because of mod_cache I guess) is requiring the
use of htcacheclean. However, it's not present on the system. By
installing it, this should fix the issue.

Change-Id: I6bf1790b0511a0006408144fb2f98ec2a9896825

manifests/api.pp

@@ -51,6 +51,10 @@ class openstack_health::api(
     require => Class['::python'],
   }
 
+  package {'apache2-utils':
+    ensure => present,
+  }
+
   exec { 'requirements':
     command     => "${virtualenv_dir}/bin/pip install -U -r ${source_dir}/requirements.txt",
     require     => Python::Virtualenv[$virtualenv_dir],