Supress imem-Duplication of MNESIA overload WARNING

[stoch]

2019-04-29 17:32:44.623 [warning] [imem<0.226.0>@imem_if_mnesia:handle_info:995] [_IMEM_] {imem_if_mnesia,995} Mnesia overload : {dump_log,write_threshold}!
2019-04-29 17:32:44.644 [warning]  Mnesia('[email protected]'): ** WARNING ** Mnesia is overloaded: {dump_log,write_threshold}

The duplication of this message in imem should be suppressed.