Use the rpm_key module

Ansible provides a module to install the rpm gpg key,
we might as well use it.

Change-Id: Ief2b15661a65b37f3dbaa6e06766a80f7335f100
Signed-off-by: Chuck Short <chucks@redhat.com>

ansible/install/roles/epel/tasks/main.yml

@@ -10,8 +10,9 @@
 # The fedoraproject CDN has problems sometimes, this will keep trying
 #  for up to 10 minutes before failing.
 - name: Import EPEL GPG Key
-  shell: rpm --import {{ epel7_rpmkey }}
-  become: true
+  rpm_key:
+    state: present
+    key: "{{ epel7_rpmkey }}"
   register: import_result
   until: "import_result.rc==0"
   retries: 10