Actually write out the projects.ini config file

We have a template for it in tree, but we're not, you know,
templating it.

Change-Id: Ic6b3ecc62cdfc7c486a912ba4863c7c4c7734e0a

playbooks/roles/gerrit/tasks/main.yaml

@@ -244,6 +244,14 @@
     - manage-projects
     - track-upstream
 
+- name: Write projects.ini
+  template:
+    src: projects.ini.j2
+    dest: /home/gerrit2/projects.ini
+    owner: gerrit2
+    group: gerrit2
+    mode: 0600
+
 - name: Install apache2
   apt:
     name: