cliff.commandmanager.CommandManager gained an option, update
openstackclient.common.commandmanager.ComamndManager to match.
Also add CommandManager.get_command_groups() to return a list of the
currently loaded command groups. I expect this to be useful in
upcoming client diagnostic commands for plugins/extensions.
If these turn out to be generally useful we'll propose them to
upstream cliff.
Change-Id: Ic15a7ca0ef975ca679e753be861be7c628b8e10c
There are several reasons for this. One is that the majority of
OpenStack packages behave this way. The second is that it makes writing
software that extends something easier to test (which is a clear usecase
for openstackclient) And third, tests/__init__.py implies a global
package named "tests" - which I'm pretty sure we're not providing.
Change-Id: Ic708ffd92aea78c2ffc1a8579af0587af4fca4ff
