Adjust integrated gate for neutron changes

neutron moved in I2cfa6030cb0826665d48d2c5e73f29401b6c1f4b some jobs
in-tree, adjust integrated-gate for this.

Also, add a description for the template.

Change-Id: I00c04c148663e6fcd1b42cd66efeb4177b763a84

zuul.d/zuul-legacy-project-templates.yaml

@@ -184,6 +184,9 @@
 
 - project-template:
     name: integrated-gate
+    description: |
+      Jobs that are run across several projects to test the base
+      OpenStack functionality.
     check:
       jobs:
         - legacy-tempest-dsvm-neutron-full:
@@ -193,7 +196,7 @@
         # reminder that we don't want the job running there.
         - tempest-full:
             branches: ^(?!driverfixes/)master$
-        - legacy-grenade-dsvm-neutron:
+        - neutron-grenade:
             branches: ^(?!stable/newton).*$
     gate:
       jobs:
@@ -201,7 +204,7 @@
             branches: ^stable/(newton|ocata|pike)$
         - tempest-full:
             branches: ^(?!driverfixes/)master$
-        - legacy-grenade-dsvm-neutron:
+        - neutron-grenade:
             branches: ^(?!stable/newton).*$
     experimental:
       jobs: