Don't use os-cloud-config/common-venv elements

Moves the os-cloud-config installation to be handled by puppet instead
of the element. Also removes usage of the common-venv element since it
was only ever needed when installing other elements from source.

blueprint undercloud-elements
Change-Id: I9488cebbb479c269901e9b310a1208b6d5ed9e76

elements/puppet-stack-config/puppet-stack-config.pp

@@ -545,3 +545,4 @@ if str2bool(hiera('enable_monitoring', true)) {
 package{'firewalld':
   ensure => 'absent',
 }
+package{'os-cloud-config': }

json-files/centos-7-undercloud-packages.json

@@ -7,13 +7,11 @@
       "redhat-common",
       "undercloud-install",
       "undercloud-stack-config",
-      "common-venv",
       "undercloud-post-config",
       "enable-packages-install",
       "element-manifest",
       "ironic-conductor",
       "ipxe",
-      "os-cloud-config",
       "os-net-config",
       "puppet-stack-config",
       "selinux-permissive",

json-files/rhel-7-undercloud-packages.json

@@ -7,13 +7,11 @@
       "redhat-common",
       "undercloud-install",
       "undercloud-stack-config",
-      "common-venv",
       "undercloud-post-config",
       "enable-packages-install",
       "element-manifest",
       "ironic-conductor",
       "ipxe",
-      "os-cloud-config",
       "os-net-config",
       "puppet-stack-config"
     ],