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: I01feaef57f6b376844dabc2eed080010632a776c

zuul.yaml

@@ -8,8 +8,8 @@
 
       This performs basic host and general project setup tasks common
       to all types of unit test jobs.
-    pre-run: playbooks/unittests/pre
-    post-run: playbooks/unittests/post
+    pre-run: playbooks/unittests/pre.yaml
+    post-run: playbooks/unittests/post.yaml
 
 - job:
     name: tox
@@ -45,9 +45,9 @@
 
          Override tox requirements that have corresponding zuul git repos
          on the node by installing the git versions into the tox virtualenv.
-    run: playbooks/tox/run
-    pre-run: playbooks/tox/pre
-    post-run: playbooks/tox/post
+    run: playbooks/tox/run.yaml
+    pre-run: playbooks/tox/pre.yaml
+    post-run: playbooks/tox/post.yaml
     vars:
       tox_environment:
         NOSE_WITH_HTML_OUTPUT: 1
@@ -93,7 +93,7 @@
       Uses tox with the ``docs`` environment.
     vars:
       tox_envlist: docs
-    post-run: playbooks/tox/docs-post
+    post-run: playbooks/tox/docs-post.yaml
     success-url: html/
 
 - job:
@@ -123,7 +123,7 @@
       Run code coverage tests.
 
       Uses tox with the ``cover`` environment.
-    post-run: playbooks/tox/cover-post
+    post-run: playbooks/tox/cover-post.yaml
     vars:
       tox_envlist: cover
 
@@ -142,7 +142,7 @@
     description: |
       Build a source tarball and wheel for uploading
     run: playbooks/python/sdist.yaml
-    post-run: playbooks/python/tarball-post
+    post-run: playbooks/python/tarball-post.yaml
 
 - job:
     name: python-upload-pypi
@@ -152,22 +152,21 @@
 
       Requires a variable ``pypi_info`` be set which is a dict containing
       at least a ``username`` and ``password`` attribute.
-    post-run: playbooks/python/upload-pypi
+    post-run: playbooks/python/upload-pypi.yaml
 
 - job:
     name: trigger-readthedocs
-    description:
-      Send a trigger to the readthedocs url to tell it to build docs
+    description: Send a trigger to the readthedocs url to tell it to build docs
     nodeset:
       nodes: []
-    run: playbooks/python/readthedocs
+    run: playbooks/python/readthedocs.yaml
 
 - job:
     name: multinode
     description: |
       Do additional setup needed for multi-node jobs such as setting up
       overlay networks and setting up known-hosts and ssh keys
-    pre-run: playbooks/multinode/pre
+    pre-run: playbooks/multinode/pre.yaml
 
 - job:
     name: javascript-base
@@ -185,8 +184,8 @@
          :default: {{ zuul.project.src_dir }}
 
          Path to operate in.
-    pre-run: playbooks/javascript/pre
-    post-run: playbooks/javascript/post
+    pre-run: playbooks/javascript/pre.yaml
+    post-run: playbooks/javascript/post.yaml
 
 - job:
     name: build-javascript-tarball
@@ -206,4 +205,4 @@
 
          Path to operate in.
 
-    run: playbooks/javascript/tarball
+    run: playbooks/javascript/tarball.yaml