The main motivation is to wrap the bucket DB and metainfo DB, so we
could check if a bucket is empty before applying geofencing config.
Change-Id: I8bac21555e01d51a663fb557bc1acfc8106bc2e1
Added MFA passcode and recovery code field for token requests.
Added endpoints for MFA-related activity: enabling MFA,
disabling MFA, generating a new MFA secret key, and
generating new MFA recovery codes.
Change-Id: Ia1443f05d3a2fecaa7f170f56d73c7a4e9b69ad5
