Add openstack/placement as a required project for ironic-grenade*

In order to get openstack/placement installed as part of the
ironic grenade jobs, we have to list it as a required project.

Needed by https://review.openstack.org/604454/

Change-Id: I3922ef15ef8b4517f653a37ca137ba30c8ca5643

playbooks/legacy/grenade-dsvm-ironic-multinode-multitenant/run.yaml

@@ -52,7 +52,9 @@
     - shell:
         cmd: |
           cat << 'EOF' >> ironic-extra-vars
-            export PROJECTS="openstack-dev/grenade $PROJECTS"
+            # Grenade needs to clone the placement repo on the Stein side since
+            # the repo did not exist in Rocky.
+            export PROJECTS="openstack-dev/grenade openstack/placement $PROJECTS"
             export DEVSTACK_GATE_GRENADE=pullup
             export DEVSTACK_GATE_OS_TEST_TIMEOUT=2400
             export DEVSTACK_GATE_TEMPEST_BAREMETAL_BUILD_TIMEOUT=1200

playbooks/legacy/grenade-dsvm-ironic/run.yaml

@@ -30,7 +30,9 @@
     - shell:
         cmd: |
           cat << 'EOF' >> ironic-extra-vars
-            export PROJECTS="openstack-dev/grenade $PROJECTS"
+            # Grenade needs to clone the placement repo on the Stein side since
+            # the repo did not exist in Rocky.
+            export PROJECTS="openstack-dev/grenade openstack/placement $PROJECTS"
             export DEVSTACK_GATE_GRENADE=pullup
             export DEVSTACK_GATE_OS_TEST_TIMEOUT=2400
             export DEVSTACK_GATE_TEMPEST_BAREMETAL_BUILD_TIMEOUT=1200

zuul.d/legacy-ironic-jobs.yaml

@@ -82,6 +82,10 @@
       - openstack/pyghmi
       - openstack/python-ironicclient
       - openstack/virtualbmc
+      # openstack/placement is not part of legacy-dsvm-base because that is
+      # branchless and openstack/placement only has a master branch (it is
+      # new as of Stein)
+      - openstack/placement
 
 - job:
     name: ironic-grenade-dsvm-multinode-multitenant
@@ -98,6 +102,10 @@
       - openstack/pyghmi
       - openstack/python-ironicclient
       - openstack/virtualbmc
+      # openstack/placement is not part of legacy-dsvm-base because that is
+      # branchless and openstack/placement only has a master branch (it is
+      # new as of Stein)
+      - openstack/placement
     nodeset: legacy-ubuntu-xenial-2-node
 
 - job: