Revert "Make all functional jobs non-voting"

This reverts commit fcdf286acd7cd24065d0e0ba562fe82f5f84d8e9.

Reason for revert:
All jobs are supposed to be fixed now.

Change-Id: Id3e97ea3ef8e1da8bd74685596f7d09fca019d77
diff --git a/.zuul.yaml b/.zuul.yaml
index 114d918..74ebce3 100644
--- a/.zuul.yaml
+++ b/.zuul.yaml
@@ -54,24 +54,15 @@
       - tempest-plugin-jobs
     check:
       jobs:
-        - heat-functional:
-            voting: false
-        - heat-functional-legacy:
-            voting: false
-        - heat-functional-convg-train:
-            voting: false
-        - heat-functional-orig-train:
-            voting: false
-        - heat-functional-ussuri:
-            voting: false
-        - heat-functional-victoria:
-            voting: false
-        - heat-functional-wallaby:
-            voting: false
+        - heat-functional
+        - heat-functional-legacy
+        - heat-functional-convg-train
+        - heat-functional-orig-train
+        - heat-functional-ussuri
+        - heat-functional-victoria
+        - heat-functional-wallaby
     gate:
       queue: heat
       jobs:
-        - heat-functional:
-            voting: false
-        - heat-functional-legacy:
-            voting: false
+        - heat-functional
+        - heat-functional-legacy