Fix zuul/jobs test jobs

This project is still trying to build Gerrit 3.3 and 3.4. These builds
fail which isn't surprising as Gerrit no longer supports these versions.
Update testing to test 3.5 through 3.8 dropping 3.3 and 3.4.

Change-Id: I585d56109b8df87372c18c385182d75eabc822ec
diff --git a/zuul.d/project.yaml b/zuul.d/project.yaml
index afe9a66..3fa6e13 100644
--- a/zuul.d/project.yaml
+++ b/zuul.d/project.yaml
@@ -6,7 +6,8 @@
         - test-gerrit-plugin-build
         - test-gerrit-build-master
         - test-gerrit-build-stable-3.5
-        - test-gerrit-build-stable-3.4
-        - test-gerrit-build-stable-3.3
+        - test-gerrit-build-stable-3.6
+        - test-gerrit-build-stable-3.7
+        - test-gerrit-build-stable-3.8
         - test-gitiles-build-master
         - test-install-build-essential
diff --git a/zuul.d/test-jobs.yaml b/zuul.d/test-jobs.yaml
index 767de07..064bee2 100644
--- a/zuul.d/test-jobs.yaml
+++ b/zuul.d/test-jobs.yaml
@@ -63,10 +63,11 @@
       - roles/copy-plugin-deps/.*
       - playbooks/gerrit/.*
 
+# TODO remove unsupported stable gerrit builds.
 - job:
-    name: test-gerrit-build-stable-3.5
+    name: test-gerrit-build-stable-3.3
     parent: test-gerrit-build-master
-    override-checkout: stable-3.5
+    override-checkout: stable-3.3
 
 - job:
     name: test-gerrit-build-stable-3.4
@@ -74,9 +75,24 @@
     override-checkout: stable-3.4
 
 - job:
-    name: test-gerrit-build-stable-3.3
+    name: test-gerrit-build-stable-3.5
     parent: test-gerrit-build-master
-    override-checkout: stable-3.3
+    override-checkout: stable-3.5
+
+- job:
+    name: test-gerrit-build-stable-3.6
+    parent: test-gerrit-build-master
+    override-checkout: stable-3.6
+
+- job:
+    name: test-gerrit-build-stable-3.7
+    parent: test-gerrit-build-master
+    override-checkout: stable-3.7
+
+- job:
+    name: test-gerrit-build-stable-3.8
+    parent: test-gerrit-build-master
+    override-checkout: stable-3.8
 
 - job:
     name: test-gitiles-build-master