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: I5c8b8d102829e84179f94e10a7464008ac5753c4
Partial-Bug: #1741634

defaults/main.yml

@@ -146,7 +146,6 @@ sahara_service_in_ldap: False
 # Sahara packages that must be installed before anything else
 sahara_requires_pip_packages:
   - virtualenv
-  - virtualenv-tools
   - python-keystoneclient # Keystoneclient needed to OSA keystone lib
   - httplib2
 

tasks/sahara_install.yml

@@ -111,9 +111,12 @@
     - sahara_get_venv | changed
 
 - name: Update virtualenv path
-  command: >
-    virtualenv-tools --update-path=auto --reinitialize {{ sahara_bin | dirname }}
+  shell: |
+    find {{ sahara_bin }} -name \*.pyc -delete
+    sed -si '1s/^.*python.*$/#!{{ sahara_bin | replace ('/','\/') }}\/python/' {{ sahara_bin }}/*
   when: sahara_get_venv | changed
+  tags:
+    - skip_ansible_lint
 
 - name: Record the venv tag deployed
   ini_file: