return volume_id/device even when volume mapping already exists
Fixes #4540 Use shared module snippet to evaluate ec2 credentials
Merge pull request #4770 from dragon3/devel

ec2_vol: return volume_id/device even when volume mapping already exists
Document env dependency for test-module.

You need to source hacking/env-setup before running hacking/test-module;
otherwise you get an error like this:

    ImportError: No module named ansible.utils
dont sudo if sudo_user is the same as the active user
Merge pull request #4774 from rsutphin/source_env_in_mod_dev_docs

Document env dependency for test-module
Merge pull request #4775 from steverweber/fix-4640

dont sudo if sudo_user is the same as the connection user
include_vars plugin should look in vars/ path for a role.
Update module documentation.
check more files using make pyflakes ( ie subdirectory of lib/ansible/ )
Merge pull request #4782 from mscherer/improve_pyflakes_makefile

check more files using make pyflakes ( ie subdirectory of lib/ansible/ )