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: I02b7f6ce8c550a7d64dee908876ccb9a146e959a
Partial-Bug: #1741634

defaults/main.yml

@@ -124,7 +124,6 @@ ceilometer_requires_pip_packages:
   - httplib2
   - python-keystoneclient # Keystoneclient needed to OSA keystone lib
   - virtualenv
-  - virtualenv-tools
 
 # Common pip packages
 ceilometer_pip_packages:

tasks/ceilometer_install.yml

@@ -125,9 +125,13 @@
     - ceilometer_get_venv | changed
 
 - name: Update virtualenv path
-  command: >
-    virtualenv-tools --update-path=auto --reinitialize {{ ceilometer_bin | dirname }}
+  shell: |
+    find {{ ceilometer_bin }} -name \*.pyc -delete
+    sed -si '1s/^.*python.*$/#!{{ ceilometer_bin | replace ('/','\/') }}\/python/' {{ ceilometer_bin }}/*
+    virtualenv {{ ceilometer_bin | dirname }}
   when: ceilometer_get_venv | changed
+  tags:
+    - skip_ansible_lint
 
 - name: Record the venv tag deployed
   ini_file: