Fix myriad bugs in playbooks

Update inventory

tasks/centos/packages.yml

@@ -1,7 +1,4 @@
-- name: Load package variables
-  include_vars:
-    file: packages.yml
-
+---
 - name: Install global packages using YUM
   become: true
   yum:

tasks/centos/repositories.yml

@@ -1,3 +1,4 @@
+---
 - name: Enable Extra Packages for Enterprise Linux
   become: true
   yum_repository:
@@ -23,4 +24,5 @@
     regex: enabled=1
     line: enabled=0
     path: /etc/yum/pluginconf.d/subscription-manager.conf
+    create: yes
     state: present