Adding the following Test Coverage for RedHat and Debian OS:

 - Use mysql_db module to create, delete databases using different encoding.
 - Backup/Restore databases using different file format: sql, gz and bz2.
 - Create and delete databases using different user privilege.
 - Assert database creation, deleting and content using system commands.

Add the start of an integration test structure using Ansible playbooks, also added an assert action plugin to make writing those easier.

hacking/env-setup now adds the configured library path in ANSIBLE_CONFIG
to the ANSIBLE_LIBRARY environment variable in addition to the previous
default of ANSIBLE_HOME/library.

This replaces #5950.

changelogs yet since this isn't released yet (but 0.3 is)

Also make pep8 show all messages rather than just 1 per code.

constants file so as to not repeat constants between CLI and lib.