Add metrics-reporter-graphite plugin to the checks pipeline

Change-Id: Ia618215468547a89b230609070274a13c7d8960d

zuul.d/projects.yaml

diff --git a/zuul.d/projects.yaml b/zuul.d/projects.yaml
index b129200..7c2641b 100644
--- a/zuul.d/projects.yaml
+++ b/zuul.d/projects.yaml
@@ -207,6 +207,12 @@
         - gerrit-plugin-build
 
 - project:
+    name: plugins/metrics-reporter-graphite
+    check:
+      jobs:
+        - gerrit-plugin-build
+
+- project:
     name: plugins/metrics-reporter-prometheus
     check:
       jobs: