Don't install setuptools/pip/virtualenv from RPMs

Openstack infra has them already installed and we are not supose to
install it, for example at fedora the exclude them explitcitly from the
dnf.conf

Change-Id: I3b276e159ff7534777219975995fc20c967d0e42
Store: https://tree.taiga.io/project/tripleo-ci-board/task/248?kanban-status=1447275

roles/build-test-packages/tasks/main.yml

@@ -10,13 +10,23 @@
     - libffi-devel
     - mock
     - openssl-devel
-    - python-virtualenv
     - rpm-build
     - sqlite
     - redhat-rpm-config
     - rpmdevtools
     - libselinux-python
 
+- name: Check if virtualenv is in the system
+  shell: command -v virtualenv >/dev/null 2>&1
+  register: virtualenv_exist
+  ignore_errors: yes
+
+- when: virtualenv_exist.rc == 1
+  name: Install virtualenv
+  package:
+    name: python-virtualenv
+    state: present
+
 - name: Create mock group
   become: yes
   group: name=mock state=present

roles/overcloud-prep-containers/tasks/overcloud-prep-containers.yml

@@ -1,8 +1,14 @@
 ---
 - when: update_containers|bool
   block:
-    - name: Install python-setuptools
-      yum:
+    - name: check if python setup tool is installed
+      shell: command -v easy-install >/dev/null 2>&1
+      register: easy_install_exists
+      ignore_errors: yes
+
+    - when: easy_install_exists.rc == 1
+      name: Install python setuptools
+      package:
         name: python-setuptools
         state: latest
       become: true

roles/validate-tempest/tasks/tempest-venv.yml

@@ -20,12 +20,23 @@
     version: '{{ tempest_conf_version }}'
   when: release != 'newton'
 
+
+- name: Check if virtualenv is in the system
+  shell: command -v virtualenv >/dev/null 2>&1
+  register: virtualenv_exist
+  ignore_errors: yes
+
+- when: virtualenv_exist.rc == 1
+  name: Install virtualenv
+  package:
+    name: python-virtualenv
+    state: present
+
 - name: Install packages required for create venv
   package: name={{ item }} state=present
   with_items:
     - libffi-devel
     - openssl-devel
-    - python-virtualenv
     - gcc
 
 - name: Set tempest init command