[server_utils] Only receive PPA key if it isn't expired

Sometimes this task fails due to networking issues, but it shouldn't run
unconditionally anyway.

playbooks/roles/server_utils/tasks/main.yml

@@ -28,7 +28,7 @@
 
 - name: remove expired edx key
   command: "sudo apt-key adv --keyserver {{ SERVER_UTILS_EDX_PPA_KEY_SERVER }} --recv-keys {{ SERVER_UTILS_EDX_PPA_KEY_ID }}"
-  when: ansible_distribution in common_debian_variants and "'expired' in  ppa_key_status.stdout"
+  when: ansible_distribution in common_debian_variants and 'expired' in ppa_key_status.stdout
 
 - name: Install ubuntu system packages
   apt: