* Rename kolla namespace to kolla_ansible
* remove oslo.config.opts entry points which is uesless
* delete useless tools/version-check.py script

Change-Id: I005dd7223ff23afbb2ce8cbfd0ebec0969102798

Typical usage:
   cp /etc/kolla/passwords.yml /etc/kolla/passwords.yml.old
   kolla-genpwd
   kolla-mergepwd --old /etc/kolla/passwords.yml.old \
                  --new /etc/kolla/passwords.yml     \
                  --final /etc/kolla/passwords.yml

Change-Id: Ibbc598909e28e096145841aec929d0cfcf8f7cab
Implements: blueprint kolla-merge-passwords