Fix bug in the logging metering errors

Shivam Bairoliyarequested to merge
sbairoliya/fix_identity_log into master

This line is result in errors UnboundLocalError: local variable 'identity' referenced before assignment

The actual exception arises from using the ORM object ClientIdentityEntry as the client identity here, which can be fixed by replacing the usage with buildgrid._protos.buildgrid.v2.ClientIdentity in a further MR

Edited by Shivam Bairoliya

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