Create python-linters job

Here we are creating out first in-repo job configuration for zuulv3.
One of the more simpler jobs we can define is the tox -epep8 job.

Change-Id: I4ecacf1b9ca664a98f06f5b998f19410fa7ea11d
Signed-off-by: Paul Belanger <pabelanger@redhat.com>

.zuul.yaml

@@ -0,0 +1,12 @@
+- job:
+    name: python-linters
+    pre-run: pre
+    nodes:
+      - name: worker
+        image: ubuntu-xenial
+
+- project:
+    name: openstack-infra/zuul
+    check:
+      jobs:
+        - python-linters

playbooks/pre.yaml

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+- hosts: all
+  roles:
+    - prepare-workspace

playbooks/python-linters.yaml

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+- hosts: all
+  tasks:
+    - name: Run a tox -e pep8.
+      include_role:
+        name: run-tox
+      vars:
+        run_tox_eventlist: pep8

playbooks/roles/prepare-workspace/defaults/main.yaml

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+---
+# tasks/main.yaml
+prepare_workspace_root: /home/zuul/workspace

playbooks/roles/prepare-workspace/tasks/main.yaml

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+- name: Ensure console.log does not exist.
+  file:
+    path: /tmp/console.log
+    state: absent
+
+- name: Start zuul_console daemon.
+  zuul_console:
+    path: /tmp/console.log
+    port: 19885
+
+- name: Create workspace directory.
+  file:
+    path: "{{ prepare_workspace_root }}"
+    owner: zuul
+    group: zuul
+    state: directory
+
+- name: Synchronize src repos to workspace directory.
+  synchronize:
+    dest: "{{ prepare_workspace_root }}"
+    src: "{{ zuul.launcher.src_root }}"

playbooks/roles/run-tox/defaults/main.yaml

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+---
+# tasks/main.yaml
+run_tox_eventlist:

playbooks/roles/run-tox/tasks/main.yaml

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+- name: Run tox
+  shell: "/usr/local/jenkins/slave_scripts/run-tox.sh {{ run_tox_eventlist }}"
+  args:
+    chdir: "/home/zuul/workspace/src/{{ zuul.project }}"