Switch to upstream Zuul container images

All of the pending bugfixes that necessitated running with local
patches have been merged upstream, so let's switch to using the
upstream container images.

Change-Id: I27e1f14f7eb4a37d26f1e8666fb97c18e2ca352e
diff --git a/k8s/zuul.yaml b/k8s/zuul.yaml
index 6153cbc..1cd88e1 100644
--- a/k8s/zuul.yaml
+++ b/k8s/zuul.yaml
@@ -147,7 +147,7 @@
     spec:
       containers:
       - name: web
-        image: jeblair/zuul-web:latest
+        image: zuul/zuul-web:latest
         args:
         - /usr/local/bin/zuul-web
         - -d
@@ -194,7 +194,7 @@
         runAsGroup: 10001
       containers:
       - name: executor
-        image: jeblair/zuul-executor:latest
+        image: zuul/zuul-executor:latest
         args:
         - /usr/local/bin/zuul-executor
         - -d
@@ -255,7 +255,7 @@
     spec:
       containers:
       - name: scheduler
-        image: jeblair/zuul-scheduler:latest
+        image: zuul/zuul-scheduler:latest
         args:
         - /usr/local/bin/zuul-scheduler
         - -d