log: fix VEvent to consider the verbosity of the caller module
log: fix VEvent to consider the verbosity of the caller module

It was broken when --vmodule was set (so the caller had a
different verbosity than the "log" module itself).

vaibhavarora/cockroach,paperstreet/cockroach,paperstreet/cockroach,glycerine/cockroach,veteranlu/cockroach,glycerine/cockroach,cockroachdb/cockroach,cockroachdb/cockroach,vaibhavarora/cockroach,glycerine/cockroach,glycerine/cockroach,glycerine/cockroach,cockroachdb/cockroach,veteranlu/cockroach,glycerine/cockroach,maxlang/cockroach,petermattis/cockroach,paperstreet/cockroach,maxlang/cockroach,cockroachdb/cockroach,vaibhavarora/cockroach,petermattis/cockroach,paperstreet/cockroach,veteranlu/cockroach,vaibhavarora/cockroach,glycerine/cockroach,cockroachdb/cockroach,paperstreet/cockroach,veteranlu/cockroach,maxlang/cockroach,paperstreet/cockroach,vaibhavarora/cockroach,maxlang/cockroach,veteranlu/cockroach,petermattis/cockroach,glycerine/cockroach,cockroachdb/cockroach,vaibhavarora/cockroach,paperstreet/cockroach,maxlang/cockroach,petermattis/cockroach,veteranlu/cockroach,veteranlu/cockroach,maxlang/cockroach,vaibhavarora/cockroach,maxlang/cockroach,cockroachdb/cockroach,petermattis/cockroach,maxlang/cockroach,paperstreet/cockroach,cockroachdb/cockroach,petermattis/cockroach,petermattis/cockroach,veteranlu/cockroach,petermattis/cockroach,vaibhavarora/cockroach