Remove mysql reporters

These are now implied for every pipeline by upstream Zuul

Change-Id: I0dc3fb9ffd34fd648029dcec898c76fff60f3686

zuul.d/pipelines.yaml

@@ -49,14 +49,12 @@
       github:
         check: 'success'
         comment: false
-      mysql:
     failure:
       gerrit:
         Verified: -1
       github:
         check: 'failure'
         comment: false
-      mysql:
 
 - pipeline:
     name: gate
@@ -96,11 +94,9 @@
       gerrit:
         Verified: 2
         submit: true
-      mysql:
     failure:
       gerrit:
         Verified: -2
-      mysql:
     window-floor: 20
     window-increase-factor: 2
 
@@ -122,10 +118,8 @@
         - event: change-merged
     success:
       gerrit: {}
-      mysql:
     failure:
       gerrit: {}
-      mysql:
 
 - pipeline:
     name: release
@@ -140,7 +134,3 @@
       github:
         - event: push
           ref: ^refs/tags/.*$
-    success:
-      mysql:
-    failure:
-      mysql: