Missing import for ansible.errors (pylint)

Do not import all ansible errors and fix the exception raised

Pylint warning, the method _warning is called warning

Pylint show a error "no deprecations variable"

Add another error, who seems to be all over the place

Add back AnsibleFileNotFound ( used in connection plugins )

Improvements to OpenStack inventory script

This reverts the previous commit (d71834d1) and instead fixes the problem
by making sure that options used by ConnectionInformation do not have
defaults set in the playbook objects so they're properly inherited from
the CLI options object if not otherwise specified in the play

Moving this above the play setting means that any default values set
in play (like connection) override any corresponding CLI option, which
is wrong. Generally CLI options should override things set in playbooks

Git integration test: remove test for ambiguous .git/branches dir

Import fixes

Import queue from six.moves for python3 compatibility.

Add test requirements for working with v2.

Change how we're calling StringIO

Print function

Import StringIO from six in a couple more places.

Several more changes to support python3 syntax.

Fixed wrong example of 'environment' for setting PATH