Added pep8 to check and gate jobs

Added project information to projects.yaml and test name to layout.yaml for gerrit-powered-agenda project.

Change-Id: I9e49f5ef65675192ece3d85f130c6a70725fca2b

modules/openstack_project/files/jenkins_job_builder/config/projects.yaml

@@ -394,6 +394,14 @@
     jobs:
       - python-jobs
 
+- project:
+    name: gerrit-powered-agenda
+    github-org: openstack-infra
+    node: bare-precise
+    tarball-site: tarballs.openstack.org
+
+    jobs:
+      - python-jobs
 
 - project:
     name: gerritbot

modules/openstack_project/files/zuul/layout.yaml

@@ -2733,9 +2733,9 @@ projects:
 
   - name: openstack-infra/gerrit-powered-agenda
     check:
-      - noop
+      - gate-gerrit-powered-agenda-pep8
     gate:
-      - noop
+      - gate-gerrit-powered-agenda-pep8
 
   - name: openstack-infra/gerritbot
     check: