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: If5d213bbe27c7f07508f4c20e7d3f5d911ba974d
Partial-Bug: #1741634

defaults/main.yml

@@ -115,7 +115,6 @@ zaqar_unreliable: true
 # zaqar packages that must be installed before anything else
 zaqar_requires_pip_packages:
   - virtualenv
-  - virtualenv-tools
   - python-keystoneclient # Keystoneclient needed to OSA keystone lib
 
 # Common pip packages

tasks/zaqar_install.yml

@@ -123,9 +123,11 @@
     - zaqar-pip-packages
 
 - name: Update virtualenv path
-  command: >
-    virtualenv-tools --update-path=auto --reinitialize {{ zaqar_bin | dirname }}
+  shell: |
+    find {{ zaqar_bin }} -name \*.pyc -delete
+    sed -si '1s/^.*python.*$/#!{{ zaqar_bin | replace ('/','\/') }}\/python/' {{ zaqar_bin }}/*
   when: zaqar_get_venv | changed
   tags:
+    - skip_ansible_lint
     - zaqar-install
     - zaqar-pip-packages