Revert "Use the gerrit driver for the googlesource connection"

This reverts commit 01bef804de.

This was missing an option, and also our password doesn't work.

Change-Id: I317c29034efaae62ea74a5c16ec25bed98c1e3cc

hiera/group/zuul-executor.yaml

@@ -11,8 +11,5 @@ zuul_connections:
     driver: 'github'
 
   - name: 'googlesource'
-    driver: 'gerrit'
-    server: 'gerrit-review.googlesource.com'
-    canonical_hostname: 'gerrit.googlesource.com'
-    user: 'git-infra-root.openstack.org'
-    stream_events: 'false'
+    driver: 'git'
+    baseurl: https://gerrit.googlesource.com

hiera/group/zuul-merger.yaml

@@ -41,8 +41,5 @@ zuul_connections:
     driver: 'github'
 
   - name: 'googlesource'
-    driver: 'gerrit'
-    server: 'gerrit-review.googlesource.com'
-    canonical_hostname: 'gerrit.googlesource.com'
-    user: 'git-infra-root.openstack.org'
-    stream_events: 'false'
+    driver: 'git'
+    baseurl: https://gerrit.googlesource.com

hiera/group/zuul-scheduler.yaml

@@ -31,11 +31,8 @@ zuul_connections:
     rate_limit_logging: 'false'
 
   - name: 'googlesource'
-    driver: 'gerrit'
-    server: 'gerrit-review.googlesource.com'
-    canonical_hostname: 'gerrit.googlesource.com'
-    user: 'git-infra-root.openstack.org'
-    stream_events: 'false'
+    driver: 'git'
+    baseurl: https://gerrit.googlesource.com
 
 gearman_server_ssl_cert: |
   -----BEGIN CERTIFICATE-----