[feature] wait for frontend when configuring

Ansible allows us to wait for the node to become available, which should
allow us to launch the `configure` command as soon as `create --wait`
completes.

Uses default wait_for_connection module, which should poll for 10
minutes.

Requires that we disable gather_fact, and reactivate it after the
connection succeeds.

chi-appliance.py

@@ -146,7 +146,12 @@ def do_configure(argv):
     confpath = os.path.join(mypath, 'ansible')
     playbook = ('---\n'
                 '- hosts: all\n'
+                '  gather_facts: no\n'
                 '  tasks:\n'
+                '    - name: Wait for frontend\n'
+                '      wait_for_connection:\n'
+                '    - name: Gather info about frontend\n'
+                '      setup:\n'
                 '    - name: Ensure dependencies are installed\n'
                 '      package:\n'
                 '        name: "{{ item }}"\n'