Support copying scripts outside of modules

Support copying some utility scripts directly,
without requiring them to be associated with a
python module.

Change-Id: Iee304986b13baf1f0b2d4578c4fc962bea8c1877
Script for running unit tests in other projects

Import a version of the script from oslo.test for running
unit tests in other projects using the current package's
code. We will use this to set up cross-test jobs for oslo
libraries.

Change-Id: I1ef5ba38a99c45557148cd9c1af0c49304caa8c7
Merge "Support copying scripts outside of modules"
Merge "Script for running unit tests in other projects"