Import GPG key for NGINX via Ansible

The GPG key for NGINX was added manually therefore YUM would try
to pull it down and fail because the repository cache would not
allow any requests that tried to pull down a GPG key.

This patch adds it via Ansible beforehand that way it doesn't go
through the proxy.

Change-Id: I96ad7f049ab72ce338596ae34362e3a4ca026bb6

tasks/keystone_install.yml

@@ -51,12 +51,23 @@
     - ansible_pkg_mgr in ['yum', 'dnf']
     - keystone_sp != {}
 
+- name: Add NGINX repository keys
+  rpm_key:
+    key: "{{ keystone_nginx_gpg_key }}"
+    state: present
+  when:
+    - ansible_pkg_mgr in ['yum', 'dnf']
+    - keystone_web_server == 'nginx'
+  register: add_nginx_key
+  until: add_nginx_key is success
+  retries: 5
+  delay: 2
+
 - name: Add NGINX repository
   yum_repository:
     name: nginx
     description: 'nginx repo'
     baseurl: "{{ keystone_nginx_repo }}"
-    gpgkey: "{{ keystone_nginx_gpg_key }}"
   when:
     - ansible_pkg_mgr in ['yum', 'dnf']
     - keystone_web_server == 'nginx'