Remove pip install paunch

We now have python-paunch-1.1.1 [1] in the overcloud images so we do not
need to pip install it any longer.

[1] https://trunk.rdoproject.org/centos7-master-head/current/python-paunch-1.1.1-0.20170602043913.c8e22e5.el7.centos.noarch.rpm

Change-Id: I1ede514a8aee7ac217fa75843e67fb6542e06f99

docker/docker-steps.j2

@@ -139,10 +139,6 @@ resources:
                         - name: Write kolla config json files
                           copy: content="{{item.value|to_json}}" dest="{{item.key}}" force=yes
                           with_dict: "{{kolla_config}}"
-                        - name: Install paunch FIXME remove when packaged
-                          shell: |
-                            yum -y install python-pip
-                            pip install paunch
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                         # Bootstrap tasks, only performed on bootstrap_server_id
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