Since tenacity 5.0.0[1], the following deprecation warning is shown if
the function used for retry_error_callback doesn't accept single
"retry_state" parameter.
DeprecationWarning: "retry_error_callback" function must accept single
"retry_state" parameter, please update <function name>
This fixes the _raise_compute_exception method causing that warning
at this moment.
[1] 846d8c8449
Change-Id: If4abc9b5567e18820377cab21dcad62cbe4cdc92