Merge pull request #4259 from edx/feanil/update_python_role

Deal with the update failing because apt is already running.

playbooks/roles/python/tasks/main.yml

@@ -4,6 +4,10 @@
 
 - name: Update apt-get
   raw: apt-get update -qq
+  register: python_update_result
+  until: python_update_result.rc == 0
+  retries: 10
+  delay: 10
 
 - name: Install packages
   raw: "apt-get install -qq {{ item }}"