Ensure pip is installed for propose-update-constraints

Pip is used by this task, make sure ensure-pip is used so it is
present.

While here, install git-review to a venv and symlink it globally to
keep things separate.

Change-Id: If6b1abd2545c68f727bddc5317797236f451b67c
Signed-off-by: Sean McGinnis <sean.mcginnis@gmail.com>
Signed-off-by: Ian Wienand <iwienand@redhat.com>

playbooks/proposal/pre.yaml

@@ -1,7 +1,23 @@
 - hosts: all
   pre_tasks:
+    - name: Ensure pip
+      include_role:
+        name: ensure-pip
+
     - name: Install git-review
-      command: pip3 install git-review
+      pip:
+        name: git-review
+        virtualenv: /opt/git-review
+        virtualenv_command: '{{ ensure_pip_virtualenv_command }}'
+      become: yes
+
+    - name: Link git-review
+      file:
+        src: /opt/git-review/bin/git-review
+        dest: /usr/local/bin/git-review
+        owner: root
+        group: root
+        state: link
       become: yes
 
     - name: Copy scripts to the script dir on the node

playbooks/pti-python-tarball/pre.yaml

@@ -1,4 +1,6 @@
 - hosts: all
   roles:
     - bindep
+    - ensure-pip
     - revoke-sudo
+