Migrate to Zuul v3

Migrate all functional jobs and gate to zuul v3.
We will have to migrate all other legacy jobs too later.
This patch do step 1 in the docs: Move Legacy Jobs to Projects.

Change-Id: Ic6d755d88cec2f1aa98e042f75fd674602aca8a9

.zuul.yaml

@@ -0,0 +1,21 @@
+- job:
+    name: oslo.log-src-grenade-devstack
+    parent: legacy-dsvm-base
+    voting: false
+    irrelevant-files:
+      - ^(test-|)requirements.txt$
+      - ^setup.cfg$
+    post-run: playbooks/legacy/oslo.log-src-grenade-devstack/post
+    required-projects:
+      - openstack-dev/grenade
+      - openstack-infra/devstack-gate
+      - openstack/oslo.log
+    run: playbooks/legacy/oslo.log-src-grenade-devstack/run
+    timeout: 10800
+
+- project:
+    name: openstack/oslo.log
+    check:
+      jobs:
+        - oslo.log-src-grenade-devstack
+

playbooks/legacy/oslo.log-src-grenade-devstack/post.yaml

@@ -0,0 +1,15 @@
+- hosts: primary
+  tasks:
+
+    - name: Copy files from {{ ansible_user_dir }}/workspace/ on node
+      synchronize:
+        src: '{{ ansible_user_dir }}/workspace/'
+        dest: '{{ zuul.executor.log_root }}'
+        mode: pull
+        copy_links: true
+        verify_host: true
+        rsync_opts:
+          - --include=/logs/**
+          - --include=*/
+          - --exclude=*
+          - --prune-empty-dirs

playbooks/legacy/oslo.log-src-grenade-devstack/run.yaml

@@ -0,0 +1,50 @@
+- hosts: all
+  name: Autoconverted job legacy-oslo.log-src-grenade-dsvm from old job gate-oslo.log-src-grenade-dsvm-ubuntu-xenial-nv
+  tasks:
+
+    - name: Ensure legacy workspace directory
+      file:
+        path: '{{ ansible_user_dir }}/workspace'
+        state: directory
+
+    - shell:
+        cmd: |
+          set -e
+          set -x
+          cat > clonemap.yaml << EOF
+          clonemap:
+            - name: openstack-infra/devstack-gate
+              dest: devstack-gate
+          EOF
+          /usr/zuul-env/bin/zuul-cloner -m clonemap.yaml --cache-dir /opt/git \
+              git://git.openstack.org \
+              openstack-infra/devstack-gate
+        executable: /bin/bash
+        chdir: '{{ ansible_user_dir }}/workspace'
+      environment: '{{ zuul | zuul_legacy_vars }}'
+
+    - shell:
+        cmd: |
+          set -e
+          set -x
+          export PROJECTS="openstack-dev/grenade $PROJECTS"
+          export PYTHONUNBUFFERED=true
+          export DEVSTACK_GATE_TEMPEST=1
+          export DEVSTACK_GATE_GRENADE=pullup
+          export BRANCH_OVERRIDE=default
+          if [ "$BRANCH_OVERRIDE" != "default" ] ; then
+              export OVERRIDE_ZUUL_BRANCH=$BRANCH_OVERRIDE
+          fi
+          export DEVSTACK_PROJECT_FROM_GIT=$ZUUL_SHORT_PROJECT_NAME
+
+          # Even if the branch is overridden, make sure we use
+          # the correct branch using the OVERRIDE_*_PROJECT_BRANCH
+          # variable.
+          uc_project=`echo $DEVSTACK_PROJECT_FROM_GIT | tr [:lower:] [:upper:] | tr '-' '_' | sed 's/[^A-Z_]//'`
+          export "OVERRIDE_"$uc_project"_PROJECT_BRANCH"=$ZUUL_BRANCH
+
+          cp devstack-gate/devstack-vm-gate-wrap.sh ./safe-devstack-vm-gate-wrap.sh
+          ./safe-devstack-vm-gate-wrap.sh
+        executable: /bin/bash
+        chdir: '{{ ansible_user_dir }}/workspace'
+      environment: '{{ zuul | zuul_legacy_vars }}'