Replace virtualenv-tools by a script

virtualenv-tools has a bug which gets triggered in gates: it can't
change the shebang of a virtualenv python bin/ files if they
were generated with a virtualenv script whose shebang ends with
python2 instead of python.

Because we can't modify virtualenv-tools, we use shell scripts
instead.

Change-Id: I6cc40b4fc473df29c6e3d7844fde6340694d43bb
Partial-Bug: #1741634

defaults/main.yml

@@ -258,7 +258,6 @@ cinder_service_in_ldap: false
 # Cinder packages that must be installed before anything else
 cinder_requires_pip_packages:
   - virtualenv
-  - virtualenv-tools
   - python-keystoneclient # Keystoneclient needed by the keystone Ansible module
   - httplib2
 

tasks/cinder_install.yml

@@ -111,10 +111,14 @@
     - ansible_pkg_mgr in ['yum', 'dnf', 'zypper']
     - cinder_get_venv | changed
 
-- name: Update virtualenv path
-  command: >
-    virtualenv-tools --update-path=auto --reinitialize {{ cinder_bin | dirname }}
+- name: Reset virtualenv and update its paths
+  shell: |
+    find {{ cinder_bin }} -name \*.pyc -delete
+    sed -si '1s/^.*python.*$/#!{{ cinder_bin | replace ('/','\/') }}\/python/' {{ cinder_bin }}/*
+    virtualenv {{ cinder_bin | dirname }}
   when: cinder_get_venv | changed
+  tags:
+    - skip_ansible_lint
 
 - name: Initialise the upgrade facts
   ini_file: