This change works towards making the API tests pass
against Mimic'd drivers so that real production accounts
do not need to be set up - namely:
- Mimic - Fastly
- Mimic - Keystone
It also makes the mimic fastly instance the default driver in /etc
Implements: bp/mimic-fastly
Change-Id: I35d36fbc2452fc4e2233c19abefd738c9975edd0