zuul: port the legacy multinode grenade job

Make it a native Zuul v3 job.
It is a simple variant of the base 'grenade-multinode' job
where oslo.versionedobjects is installed from source instead of pip.

Also use a slightly more common name by dropping the "-devstack"
component from the name (all grenade jobs are also devstack jobs).

Finally, remove the hardcoded xenial nodeset, thus inheriting the
default testing definition for it, and probably unbreaking
the job which has been failing so far.

Change-Id: Ia209311d57f607b2ddfcab8518264cd7f670dc8f

.zuul.yaml

 - project:
     check:
       jobs:
-        - oslo.versionedobjects-src-grenade-devstack-multinode
+        - oslo.versionedobjects-src-grenade-multinode
     templates:
       - check-requirements
       - lib-forward-testing-python3
@@ -12,17 +12,11 @@
       - release-notes-jobs-python3
 
 - job:
-    name: oslo.versionedobjects-src-grenade-devstack-multinode
-    parent: legacy-dsvm-base-multinode
+    name: oslo.versionedobjects-src-grenade-multinode
+    parent: grenade-multinode
     voting: false
     irrelevant-files:
       - ^(test-|)requirements.txt$
       - ^setup.cfg$
-    run: playbooks/legacy/oslo.versionedobjects-src-grenade-devstack-multinode/run.yaml
-    post-run: playbooks/legacy/oslo.versionedobjects-src-grenade-devstack-multinode/post.yaml
-    timeout: 10800
     required-projects:
-      - openstack/grenade
-      - openstack/devstack-gate
-      - openstack/oslo.versionedobjects
-    nodeset: legacy-ubuntu-xenial-2-node
+      - opendev.org/openstack/oslo.versionedobjects

playbooks/legacy/oslo.versionedobjects-src-grenade-devstack-multinode/post.yaml

-- 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.versionedobjects-src-grenade-devstack-multinode/run.yaml

-- hosts: primary
-  name: Autoconverted job legacy-oslo.versionedobjects-src-grenade-dsvm-multinode
-    from old job gate-oslo.versionedobjects-src-grenade-dsvm-multinode-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/devstack-gate
-              dest: devstack-gate
-          EOF
-          /usr/zuul-env/bin/zuul-cloner -m clonemap.yaml --cache-dir /opt/git \
-              https://opendev.org \
-              openstack/devstack-gate
-        executable: /bin/bash
-        chdir: '{{ ansible_user_dir }}/workspace'
-      environment: '{{ zuul | zuul_legacy_vars }}'
-
-    - shell:
-        cmd: |
-          set -e
-          set -x
-          export PROJECTS="openstack/grenade $PROJECTS"
-          export PYTHONUNBUFFERED=true
-          export DEVSTACK_GATE_TEMPEST=1
-          export DEVSTACK_GATE_GRENADE=pullup
-          export DEVSTACK_GATE_USE_PYTHON3=True
-          export BRANCH_OVERRIDE=default
-          if [ "$BRANCH_OVERRIDE" != "default" ] ; then
-              export OVERRIDE_ZUUL_BRANCH=$BRANCH_OVERRIDE
-          fi
-          export DEVSTACK_GATE_TOPOLOGY="multinode"
-          export DEVSTACK_PROJECT_FROM_GIT=$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 }}'