initialize eventlet for tests

Some tests are succeededing but should not be.
Running individual tests fails if the tests
exercise code that needs to be initialized by
keystone/common/environment

Change-Id: Ia392d0273fd8a5d12cdf43fb6ff55f1819d8f3f2
Put Pecan in as the root controller

Blueprint: keystone-pecan
Change-Id: I0172ced01bb4017d184f1d2091dba7444e59df8b