Revert a change that seemed to break the upgrade

(cherry picked from commit 276292aa)

playbooks/roles/nginx/tasks/main.yml

@@ -48,6 +48,20 @@
     - install
     - install:system-requirements
 
+# REMOVE THIS AFTER LATEST NGINX HAS BEEN DEPLOYED EVERYWHERE
+# New package does not identify conflicts properly.
+# "nginx-common" only appears as requirement for ubuntu-distributed package, thus
+# removing it will remove all nginx packages installed from Ubuntu's repo.
+# This is only required if nginx was previously installed from Ubuntu's repo
+# and you're switching to Nginx's PPA
+- name: Remove old nginx packages
+  apt:
+    name: nginx-common
+    state: absent
+  tags:
+    - install
+    - install:system-requirements
+
 - name: Install the nginx package
   apt:
     name: nginx