Zuul: add file extension to playbook path

Zuul now supports including the file extension on the playbook path
and omitting the extension is now deprecrated.  Update references
to include the extension.

Change-Id: Ia1747b6c97140b7e12972c7f7b14cb0620ead084

.zuul.yaml

@@ -3,9 +3,9 @@
     parent: devstack
     description: |
       Base job for devstack-based functional tests
-    pre-run: playbooks/osc-devstack/pre
-    run: playbooks/osc-devstack/run
-    post-run: playbooks/osc-devstack/post
+    pre-run: playbooks/osc-devstack/pre.yaml
+    run: playbooks/osc-devstack/run.yaml
+    post-run: playbooks/osc-devstack/post.yaml
     required-projects:
       - name: openstack/swift
     roles:
@@ -13,35 +13,35 @@
     timeout: 9000
     vars:
       devstack_localrc:
-        SWIFT_HASH: "1234123412341234"
-        LIBS_FROM_GIT: 'python-openstackclient'
+        SWIFT_HASH: '1234123412341234'
+        LIBS_FROM_GIT: python-openstackclient
         # NOTE(dtroyer): OSC needs to support Image v1 for a while yet so re-enable
-        GLANCE_V1_ENABLED: True
+        GLANCE_V1_ENABLED: true
         # NOTE(dtroyer): Functional tests need a bit more volume headroom
         VOLUME_BACKING_FILE_SIZE: 20G
       devstack_local_conf:
         post-config:
-          "$CINDER_CONF":
+          $CINDER_CONF:
             DEFAULT:
               # NOTE(dtroyer): OSC needs to support Volume v1 for a while yet so re-enable
-              enable_v1_api: True
+              enable_v1_api: true
       devstack_services:
-        ceilometer-acentral: False
-        ceilometer-acompute: False
-        ceilometer-alarm-evaluator: False
-        ceilometer-alarm-notifier: False
-        ceilometer-anotification: False
-        ceilometer-api: False
-        ceilometer-collector: False
-        horizon: False
-        s-account: True
-        s-container: True
-        s-object: True
-        s-proxy: True
+        ceilometer-acentral: false
+        ceilometer-acompute: false
+        ceilometer-alarm-evaluator: false
+        ceilometer-alarm-notifier: false
+        ceilometer-anotification: false
+        ceilometer-api: false
+        ceilometer-collector: false
+        horizon: false
+        s-account: true
+        s-container: true
+        s-object: true
+        s-proxy: true
       osc_environment:
         PYTHONUNBUFFERED: 'true'
-        OS_CLOUD: 'devstack-admin'
-      tox_install_siblings: False
+        OS_CLOUD: devstack-admin
+      tox_install_siblings: false
       zuul_work_dir: src/git.openstack.org/openstack/python-openstackclient
 
 # The Neutron bits are here rather than in osc-functional-devstack-base to
@@ -55,9 +55,9 @@
         # NOTE(amotoki): Some neutron features are enabled by devstack plugin
         neutron: https://git.openstack.org/openstack/neutron
       devstack_services:
-        neutron-segments: True
-        q-metering: True
-        q-qos: True
+        neutron-segments: true
+        q-metering: true
+        q-qos: true
       tox_envlist: functional
 
 - job:
@@ -66,20 +66,20 @@
     timeout: 7800
     vars:
       devstack_localrc:
-        FLAT_INTERFACE: 'br_flat'
-        PUBLIC_INTERFACE: 'br_pub'
+        FLAT_INTERFACE: br_flat
+        PUBLIC_INTERFACE: br_pub
       devstack_services:
-        n-cell: True
-        n-net: True
-        neutron: False
-        neutron-segments: False
-        q-agt: False
-        q-dhcp: False
-        q-l3: False
-        q-meta: False
-        q-metering: False
-        q-qos: False
-        q-svc: False
+        n-cell: true
+        n-net: true
+        neutron: false
+        neutron-segments: false
+        q-agt: false
+        q-dhcp: false
+        q-l3: false
+        q-meta: false
+        q-metering: false
+        q-qos: false
+        q-svc: false
       tox_envlist: functional
 
 - job:
@@ -93,19 +93,19 @@
       - openstack/python-openstacksdk
     vars:
       devstack_localrc:
-        USE_PYTHON3: True
-        LIBS_FROM_GIT: 'python-openstackclient,python-openstacksdk,osc-lib,os-client-config'
+        USE_PYTHON3: true
+        LIBS_FROM_GIT: python-openstackclient,python-openstacksdk,osc-lib,os-client-config
         # This is insufficient, but leaving it here as a reminder of what may
         # someday be all we need to make this work
         # disable_python3_package swift
-        DISABLED_PYTHON3_PACKAGES: 'swift'
+        DISABLED_PYTHON3_PACKAGES: swift
       devstack_services:
         # Swift is not ready for python3 yet: At a minimum keystonemiddleware needs
         # to be installed in the py2 env, there are probably other things too...
-        s-account: False
-        s-container: False
-        s-object: False
-        s-proxy: False
+        s-account: false
+        s-container: false
+        s-object: false
+        s-proxy: false
       tox_envlist: functional-tips
 
 - project: