Update generate_resmoke_suite.py to use common evergreen client

The generate_resmoke_suite script calls out to evergreen to get test history and other information about the task running. We recently build a python evergreen client. We should use that to access the evergreen apis instead of maintaining our own in buildscripts.

As a mongo engineer
I want generate_resmoke_suite to use a common evergreen client library
so that I don't have to maintain code to connect to evergreen.

AC

• The generate_resmoke_suite script does not use the evergreen client in buildscripts.