Pick up centos-based controller invoker [OCF-39]

This completes all of the porting of upstream images to RHT-supported
ones
diff --git a/persistent-template.yml b/persistent-template.yml
index bef2eb3..d644618 100644
--- a/persistent-template.yml
+++ b/persistent-template.yml
@@ -168,7 +168,7 @@
   required: true
 - name: OPENWHISK_VERSION
   description: The DockerHub tag for openwhisk/{controller,invoker}
-  value: "rhdemo-6cfa698e"
+  value: "rhdemo-88e46e8"
   required: true
 - name: PROJECTODD_VERSION
   description: The DockerHub tag for projectodd images
diff --git a/template.yml b/template.yml
index 58c8f52..8e1da27 100644
--- a/template.yml
+++ b/template.yml
@@ -153,7 +153,7 @@
   required: true
 - name: OPENWHISK_VERSION
   description: The DockerHub tag for openwhisk/{controller,invoker}
-  value: "rhdemo-6cfa698e"
+  value: "rhdemo-88e46e8"
   required: true
 - name: PROJECTODD_VERSION
   description: The DockerHub tag for projectodd images