The kolla-genpwd, kolla-mergepwd, kolla-readpwd and kolla-writepwd
commands now creates or updates passwords.yml with correct
permissions. Also they display warning message about incorrect
permissions.

Closes-Bug: #2018338
Change-Id: I4b50053ced9150499d1d09fd4a0ec2e243cf938b
Signed-off-by: Maksim Malchuk <maksim.malchuk@gmail.com>

The kolla-genpwd and kolla-mergepwd commands can be used to manipulate
the kolla passwords.yml file. The format is a YAML encoded dict of
password variable names to their values. If the format is not a dict,
the error messages are unhelpful.  In particular, this can happen if the
file is encrypted e.g. via Ansible Vault.

For kolla-genpwd:

    AttributeError: 'NoneType' object has no attribute 'items'

For kolla-mergepwd:

    AttributeError: 'NoneType' object has no attribute 'update'

This change adds a more friendly message.

Change-Id: I27f0835b904e05006ae401adf383090322e1b891
Closes-Bug: #1880220

to clean old keys on merge.

Change-Id: Ifcc99e7c737707eea9e951db066dc94fd85bd9f7

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