gather facts in deploy.yaml to allow ansible_hostname in deployment

Former-commit-id: a47e82a49cdcfb1f8895dd1407195a7be2122a4c

ansible/deploy.yaml

 ---
 - hosts: all
   become: yes
-  gather_facts: no
+  gather_facts: yes
   tasks:
     #
     # Install basic non-virtualenv requirements