When methods for passwords generation and merge are
extracted then external apps and scripts can use
those methods without resolving to subprocess execution
or injecting sys.argv.

Change-Id: I99aff7852180534129fa36859075306eea776ba9
Signed-off-by: Maciej Kucia <maciej@kucia.net>

Remove Python specific types from YAML output
Produce only basic YAML tags

Change-Id: Ib6a4c18663897efb7243ed1ff84df1c9f2abf8bf

* 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

Dumping of password dictionary can look quite different depending
on passwords structure. To always get yaml we need to use block
style for dump(), see
    http://pyyaml.org/wiki/PyYAMLDocumentation#Dictionarieswithoutnestedcollectionsarenotdumpedcorrectly

Change-Id: Ideee1aefedbba35480947956821341c6ef75088e
Closes-Bug: #1647308

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