Add Zuul configuration, fix Gerrit repo

Adds a pep8 job, and seed and overcloud deployment jobs from kayobe.

Also fixes Gerrit config, a yamllint warning and uses python3 for pep8.

Change-Id: Ie37214fb73533b4d042cf624727762d94908f55f
Depends-On: Ie8a3dc3dfba1ce0bd78ac676e3c4553461f45a05

.gitreview

@@ -1,4 +1,4 @@
 [gerrit]
 host=review.openstack.org
 port=29418
-project=openstack/dev-kayobe-config.git
+project=openstack/kayobe-config-dev.git

etc/kayobe/network-allocation.yml

@@ -1,3 +1,4 @@
+---
 aio_ips:
   controller0: 192.168.33.3
   seed: 192.168.33.5

tox.ini

@@ -10,5 +10,6 @@ deps =
     -r{toxinidir}/test-requirements.txt
 
 [testenv:pep8]
+basepython = python3
 commands =
   yamllint etc/kayobe

zuul.d/project.yaml

@@ -0,0 +1,14 @@
+---
+- project:
+    check:
+      jobs:
+        - openstack-tox-pep8
+        - kayobe-overcloud-centos
+        - kayobe-seed-centos
+
+    gate:
+      queue: kayobe
+      jobs:
+        - openstack-tox-pep8
+        - kayobe-overcloud-centos
+        - kayobe-seed-centos