Re-enable test_connection tests

Re-enable the TestGerritConnection and TestConnections test cases.

Change-Id: I23c12b23546102212990b2dca7369741efa990b6
diff --git a/tests/fixtures/zuul-connections-same-gerrit.conf b/tests/fixtures/zuul-connections-same-gerrit.conf
index af31c8a..43109d2 100644
--- a/tests/fixtures/zuul-connections-same-gerrit.conf
+++ b/tests/fixtures/zuul-connections-same-gerrit.conf
@@ -2,7 +2,7 @@
 server=127.0.0.1
 
 [zuul]
-layout_config=layout-connections-multiple-voters.yaml
+tenant_config=config/zuul-connections-same-gerrit/main.yaml
 url_pattern=http://logs.example.com/{change.number}/{change.patchset}/{pipeline.name}/{job.name}/{build.number}
 job_name_in_report=true