Ensure en language pack is installed

... to avoid the following error in rabbitmq_user provider.

Cannot parse invalid user line: /usr/bin/sh: warning:
setlocale: LC_ALL: cannot change locale (en_US.UTF-8)

Conflicts:
	playbooks/prepare-node-common.yaml

Change-Id: I22534383ef8f6e0da860f53501eb8ccbc256de87
(cherry picked from commit 400a3e51e5)
(cherry picked from commit f76e8cd88d)
(cherry picked from commit c7cf1a9c93)

playbooks/prepare-node-common.yaml

@@ -27,7 +27,8 @@
           - libxslt-devel
           - ruby-devel
           - zlib-devel
-          - rubygem-rexml
+          - langpacks-en
+          - glibc-langpack-en
 
       - name: Install yum (CentOS/RHEL)
         dnf: