Fixes for a few openQA dev setup bugs

While prepping for my demo to the testing team, I ran into a few issues.
These did not come up earlier as I was using an incomplete method for
nuking my local openQA install to test this automation.

- Check for Postgres data directory now correctly checks for a `base`
  dir rather than its parent `data` (which can exist but be empty if
  Postgres has been installed but not initialized
- firewalld service is named `http`, not `httpd`
- Automation now "logs in" to web UI, allowing fifloader.py to execute

ansible/playbooks/tasks/openqa.yml

@@ -33,7 +33,7 @@
 
 - name: Check for non-empty postgres data directory
   stat:
-    path: /var/lib/pgsql/data
+    path: /var/lib/pgsql/data/base
   register: postgres_data_dir
 
 - name: If postgresql is not already running, initialize database
@@ -68,7 +68,7 @@
     permanent: true
     state: enabled
   loop:
-    - httpd
+    - http
     - openqa-vnc
 
 - name: Permit VNC traffic for local workers
@@ -103,6 +103,11 @@
     group: "{{ openqa_group }}"
     mode: "0775"
 
+# fifloader.py will fail if the Demo user is not logged in
+- name: Authenticate to web UI the first time
+  uri:
+    url: "http://{{ openqa_host }}/login"
+
 - name: Run fifloader.py
   command: ./fifloader.py -l -c templates.fif.json templates-updates.fif.json
   changed_when: "1 != 1"