Readd legacy-puppet-syntax-3-centos-7 playbook

This was removed by accident in
I8d5a3471e7c6171848bddc9e35c0c63283d175a0 but is actually used.
Add it back in.

Closes-Bug: #1730477
Change-Id: I4e5a9d4e048d7afbe63b7f25b1bdc23f23fc63e0

playbooks/legacy/puppet-syntax-3-centos-7/run.yaml

@@ -0,0 +1,86 @@
+- hosts: all
+  name: Autoconverted job legacy-puppet-syntax-3-legacy-centos-7 from old job gate-{name}-puppet-syntax-3-legacy-centos-7
+  tasks:
+
+    - name: Ensure legacy workspace directory
+      file:
+        path: '{{ ansible_user_dir }}/workspace'
+        state: directory
+
+    - shell:
+        cmd: |
+          set -e
+          set -x
+          CLONEMAP=`mktemp`
+          function cleanup {
+              # In cases where zuul-cloner is aborted during a git
+              # clone operation, git will remove the git work tree in
+              # its cleanup. The work tree in these jobs is the
+              # workspace directory, which means that subsequent
+              # jenkins post-build actions can not run because the
+              # workspace has been removed.
+              # To reduce the likelihood of this having an impact,
+              # recreate the workspace directory if needed
+              mkdir -p $WORKSPACE
+              rm -f $CLONEMAP
+          }
+          trap cleanup EXIT
+          cat > $CLONEMAP << EOF
+          clonemap:
+            - name: $ZUUL_PROJECT
+              dest: .
+          EOF
+          /usr/zuul-env/bin/zuul-cloner -m $CLONEMAP --cache-dir /opt/git \
+              git://git.openstack.org $ZUUL_PROJECT
+        executable: /bin/bash
+        chdir: '{{ ansible_user_dir }}/workspace'
+      environment: '{{ zuul | zuul_legacy_vars }}'
+
+    - shell:
+        cmd: /usr/local/jenkins/slave_scripts/install-distro-packages.sh
+        chdir: '{{ ansible_user_dir }}/workspace'
+      environment: '{{ zuul | zuul_legacy_vars }}'
+
+    - shell:
+        cmd: |
+          set -e
+          set -x
+          if [ -f /usr/bin/yum ]; then
+              sudo yum -y remove rdo-release "centos-release-openstack-*" "centos-release-ceph-*"
+              sudo yum -y install libxml2-devel libxslt-devel ruby-devel zlib-devel
+              sudo yum -y groupinstall "Development Tools"
+              # Uninstall python-requests from pip, since we install it in
+              # system-config/install_puppet.sh
+              sudo pip uninstall requests -y || true
+          elif [ -f /usr/bin/apt-get ]; then
+              sudo apt-get update
+              sudo apt-get install -y libxml2-dev libxslt-dev ruby-dev zlib1g-dev
+          fi
+        executable: /bin/bash
+        chdir: '{{ ansible_user_dir }}/workspace'
+      environment: '{{ zuul | zuul_legacy_vars }}'
+
+    - shell:
+        cmd: |
+          set -x
+          sudo rm -f /etc/sudoers.d/zuul
+          # Prove that general sudo access is actually revoked
+          ! sudo -n true
+        executable: /bin/bash
+        chdir: '{{ ansible_user_dir }}/workspace'
+      environment: '{{ zuul | zuul_legacy_vars }}'
+
+    - shell:
+        cmd: |
+          export PUPPET_GEM_VERSION='~> 3'
+          mkdir .bundled_gems
+          export GEM_HOME=`pwd`/.bundled_gems
+          gem install bundler --no-rdoc --no-ri --verbose
+          $GEM_HOME/bin/bundle install --retry 3
+          # FUTURE_PARSER=yes is only supported by Puppet 3.x
+          if [ "3" -lt "4" ]; then
+              export FUTURE_PARSER=yes
+          fi
+          $GEM_HOME/bin/bundle exec rake syntax
+        chdir: '{{ ansible_user_dir }}/workspace'
+      environment: '{{ zuul | zuul_legacy_vars }}'