s/devstack-jobs-xenial/devstack-jobs/

We have removed the devstack-jobs job group, so rename now
devstack-jobs-xenial to devstack-jobs and remove the obsolete comment.

Change-Id: I54dbdaa97e0018e71cb88558ddb2bbcec917a62c

jenkins/jobs/devstack-gate.yaml

@@ -2501,12 +2501,9 @@
       - '{pipeline}-tempest-dsvm-nnet-{node}{suffix}'
       - '{pipeline}-tempest-dsvm-neutron-full-{node}{suffix}'
 
-# Temporary job group used so that we don't have to support node in
-# all jobs included in devstack-jobs right away. Once all do we can
-# go back to a single job group for all of the devstack jobs.
 # Jobs will get defined for gate queue.
 - job-group:
-    name: devstack-jobs-xenial
+    name: devstack-jobs
     jobs:
       - '{pipeline}-grenade-dsvm-neutron-{node}{suffix}'
       - '{pipeline}-grenade-dsvm-neutron-forward-{node}{suffix}'

jenkins/jobs/projects.yaml

@@ -3708,7 +3708,7 @@
 
     jobs:
       # Normal gate and check jobs
-      - devstack-jobs-xenial:
+      - devstack-jobs:
           pipeline: gate
           node: ubuntu-xenial
           suffix: ''