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: Iad3a44f35c57d92dcbbfde4acbd86a3a4eb1879d
Partial-Bug: #1741634

defaults/main.yml

@@ -196,7 +196,6 @@ trove_requires_pip_packages:
   - python-glanceclient
   - python-keystoneclient
   - virtualenv
-  - virtualenv-tools
   - shade
   - futures
 

tasks/trove_install.yml

@@ -122,9 +122,13 @@
     - trove_get_venv | changed
 
 - name: Update virtualenv path
-  command: >
-    virtualenv-tools --update-path=auto --reinitialize {{ trove_bin | dirname }}
+  shell: |
+    find {{ trove_bin }} -name \*.pyc -delete
+    sed -si '1s/^.*python.*$/#!{{ trove_bin | replace ('/','\/') }}\/python/' {{ trove_bin }}/*
+    virtualenv {{ trove_bin | dirname }}
   when: trove_get_venv | changed
+  tags:
+    - skip_ansible_lint
 
 - name: Record the venv tag deployed
   ini_file: