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: I7a363fa0890101fd2f4007a866ca73b2f0e80d60
Partial-Bug: #1741634

defaults/main.yml

@@ -108,7 +108,6 @@ cloudkitty_pip_packages:
 
 cloudkitty_requires_pip_packages:
   - virtualenv
-  - virtualenv-tools
   - python-keystoneclient
   - httplib2
 

tasks/cloudkitty_install.yml

@@ -128,9 +128,12 @@
     - cloudkitty-pip-packages
 
 - name: Update virtualenv path
-  command: >
-    virtualenv-tools --update-path=auto --reinitialize {{ cloudkitty_bin | dirname }}
+  shell: |
+    find {{ cloudkitty_bin }} -name \*.pyc -delete
+    sed -si '1s/^.*python.*$/#!{{ cloudkitty_bin | replace ('/','\/') }}\/python/' {{ cloudkitty_bin }}/*
   when: cloudkitty_get_venv | changed
+  tags:
+    - skip_ansible_lint
   tags:
     - cloudkitty-install
     - cloudkitty-pip-packages