Add centos8 epel GPG key

This also fixes EPEL url for CentOS 8

Change-Id: Ic6dc92895d2b35a955424de9ace485e3a894aaf8

files/gpg/RPM-GPG-KEY-EPEL-8

@@ -0,0 +1,28 @@
+-----BEGIN PGP PUBLIC KEY BLOCK-----
+
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+=84m8
+-----END PGP PUBLIC KEY BLOCK-----

tasks/ceph_preinstall_yum.yml

@@ -37,8 +37,8 @@
 - name: Install the EPEL repository
   yum_repository:
     name: ceph-client-deps
-    baseurl: "{{ (centos_epel_mirror | default ('http://download.fedoraproject.org/pub/epel')) ~ '/' ~ ansible_distribution_major_version ~ '/' ~ ansible_architecture }}"
-    description: 'Extra Packages for Enterprise Linux 7 - $basearch'
+    baseurl: "{{ (centos_epel_mirror | default ('http://download.fedoraproject.org/pub/epel')) ~ '/' ~ ansible_distribution_major_version ~ ((ansible_distribution_major_version is version('8', '<')) | ternary('/', '/Everything/')) ~ ansible_architecture }}"
+    description: "Extra Packages for Enterprise Linux {{ ansible_distribution_major_version }} - $basearch"
     gpgcheck: yes
     enabled: yes
     state: present