Add menuextender plugin checker

Change-Id: Iaaf0ee565d43203d03c1973f06a139b11b5a78b6

checkers.yaml

diff --git a/checkers.yaml b/checkers.yaml
index be3cdde..4db6d5c 100644
--- a/checkers.yaml
+++ b/checkers.yaml
@@ -161,6 +161,11 @@
     name: "Zuul Check Pipeline"
     description: "Run Zuul jobs on new patchsets"
 
+  - uuid: "zuul-check:plugins_menuextender"
+    repository: "plugins/menuextender"
+    name: "Zuul Check Pipeline"
+    description: "Run Zuul jobs on new patchsets"
+
   - uuid: "zuul-check:plugins_messageoftheday"
     repository: "plugins/messageoftheday"
     name: "Zuul Check Pipeline"

zuul/main.yaml

diff --git a/zuul/main.yaml b/zuul/main.yaml
index 95f2e32..c5ee346 100644
--- a/zuul/main.yaml
+++ b/zuul/main.yaml
@@ -45,6 +45,7 @@
           - plugins/javamelody
           - plugins/lfs
           - plugins/log-level
+          - plugins/menuextender
           - plugins/messageoftheday
           - plugins/oauth
           - plugins/project-group-structure