Variable Molecule Ephemeral Directory  (#1055)
Variable Molecule Ephemeral Directory  (#1055)

* Initial commit

* Add reload scenario to trigger env var clean

* Add logic to specify per-environment molecule ephemeral directory

This patch allows for users to specify a MOLECULE_EPHEMERAL_DIRECTORY
environment variable which molecule will parse and use in its
molecule ephemeral directory path. This is especially helpful when users
are attempting to use detox, as multiple tox tests running at the same time
will pollute Molecule's ephemeral directory with half-written files and other
strange behaviour.

* Add detox documentation

* Update config.py

* Update scenario.py

metacloud/molecule,metacloud/molecule,metacloud/molecule