Remove 'python-apt' before testing the 'apt_repository' module.  The
'apt_repository' module has the smarts to auto-install python-apt.  The
integration test will now assert the correct auto-install behavior.

Add integration tests for group_by module. Fixed bug introduced by ansible/ansible#7273 while also fixing issue described in ansible/ansible#6953

* the current state of the ELB was not reflected properly when checking
  the status after a change was made.
* invalid zones caused a traceback when enabling/disabling zones

Also adds an integration test for the above.

Fixes #7254

- reverse the order of new_directory_list returned from split_pre_existing_dir in copy module

as it should.

Signed-off-by: Timothy Appnel <tim@appnel.com>

This reverts commit 2bfaacd1.

Fixes #6821

Also added a new integration test for assemble using local assembly
with a delimiter.

Also adds an integration test for authorized_key for future validation.

Fixes #6700

Fixes #6678
Fixes #6670

Also add a unit test for vaulteditor to verify 1.0 passwords with newline chars.

Changes include:

 * Update Makefile to use credentials.yml when it exists
 * Add details on the use of the credentials.yml file to README.md.
 * Update credentials.template comments

The `apt` and `yum` modules will automatically install python dependencies.
This change updates the existing integration tests to test whether auto-install
of dependencies is functioning properly.

This commit allows to specify arrays in [group:vars] block.

Signed-off-by: Oleg Bulatov <oleg@bulatov.me>

- unified set attribute functions ... not sure why 2 identical functions
exist with diff names, now there are 3 while i repoint all modules to 1
- fixed issue with symlinks being created w/o existing src when force=no
- refactored conditionals, simplified where possible
- added tests for symlink to nonexistant source, with both force options
- made symlink on existing attomic (force)

Tests several ways to specify the repository.  For every repo added, the test
asserts that:

 * the apt-cache was updated as expected (depends on `update_cache` parameter)
 * the PPA key was installed (depends on `repo` format)