Various cleanup (#943)
Various cleanup (#943)

* Various cleanup

146, 152 - pylint
1752, 1762 - Python 3
1742, 7695/7703, 7773/7778 - Standardize getting project id from client_secrets.json

* Fix bug in update group;  specifying delivery_option causes failure

GAM-team/GAM,GAM-team/GAM