Roles now showing up
Roles now showing up

There is a bug in the roles formatter - it is writing over the input to
the function with an empty list.

Change-Id: I8ead0d52a07acb8ad99cfa29554bf0ffd5261d67
Closes-Bug: dbaas-2299

Tesora/tesora-python-troveclient,Tesora/tesora-python-troveclient