CORD-536 updated to support the setting of repo via vars

Change-Id: If8b6a23fd48b2050f3dc64d55427da150268d5cb
diff --git a/roles/dell-virt/tasks/main.yml b/roles/dell-virt/tasks/main.yml
index 1d153f3..730e3c8 100644
--- a/roles/dell-virt/tasks/main.yml
+++ b/roles/dell-virt/tasks/main.yml
@@ -3,12 +3,11 @@
 
 - name: Trust the Dell apt repository
   apt_key:
-    keyserver=pool.sks-keyservers.net
-    id=1285491434D8786F
+    data: "{{ lookup('file', 'dell_apt_key.gpg') }}"
 
 - name: Add Dell apt repo
   apt_repository:
-    repo="deb http://linux.dell.com/repo/community/{{ ansible_distribution | lower }} {{ ansible_distribution_release }} openmanage"
+    repo="{{ dell_apt_repo | default('deb http://linux.dell.com/repo/community/{{ ansible_distribution | lower }} {{ ansible_distribution_release }} openmanage') }}"
 
 - name: Install BIOS configuration scripts
   apt: