Make gitpython and eventlet work with eventlet 0.25.1
Make gitpython and eventlet work with eventlet 0.25.1

Version 0.25 is having a bad interaction with python git.
that is due to the way that eventlet unloads some modules now.
Changed to use the inject method that supports what we need intead
of the imported_patched that was having the problem

Change-Id: I79894d4f711c64f536593fffcb6959df97c38838
Closes-bug: #1845181

openstack/tripleo-common,openstack/tripleo-common