[auth][s]: remove unused generate_token method (used to be used by test_consumer which was removed a few hours ago).
[auth][s]: remove unused generate_token method (used to be used by test_consumer which was removed a few hours ago).

--HG--
branch : feature-accounts

nobita-isc/annotator-store,nobita-isc/annotator-store,ningyifan/annotator-store,happybelly/annotator-store,openannotation/annotator-store,nobita-isc/annotator-store,nobita-isc/annotator-store