Replace virtualenv-tools with 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: I8b40b4bceaf90fadecb4512c0cb9dbee143fe987
Partial-Bug: #1741634
Partial-Bug: #1764470

defaults/main.yml

@@ -93,7 +93,6 @@ panko_service_in_ldap: false
 # panko packages that must be installed before anything else
 panko_requires_pip_packages:
   - virtualenv
-  - virtualenv-tools
   - python-keystoneclient # Keystoneclient needed to OSA keystone lib
   - httplib2
 

tasks/panko_install.yml

@@ -120,10 +120,25 @@
     - ansible_pkg_mgr in ['yum', 'dnf']
     - panko_get_venv | changed
 
-- name: Update virtualenv path
-  command: >
-    virtualenv-tools --update-path=auto --reinitialize {{ panko_bin | dirname }}
+# NOTE(odyssey4me):
+# We reinitialize the venv to ensure that the right
+# version of python is in the venv, but we do not
+# want virtualenv to also replace pip, setuptools
+# and wheel so we tell it not to.
+# We do not use --always-copy for CentOS/SuSE due
+# to https://github.com/pypa/virtualenv/issues/565
+- name: Reset virtualenv and update its paths
+  shell: |
+    find {{ panko_bin }} -name \*.pyc -delete
+    sed -si '1s/^.*python.*$/#!{{ panko_bin | replace ('/','\/') }}\/python/' {{ panko_bin }}/*
+    virtualenv {{ panko_bin | dirname }} \
+        {{ (ansible_pkg_mgr == 'apt') | ternary('--always-copy', '') }} \
+        --no-pip \
+        --no-setuptools \
+        --no-wheel
   when: panko_get_venv | changed
+  tags:
+    - skip_ansible_lint
 
 - name: Record the venv tag deployed
   ini_file: