prbr: Allow write_filter to return value to qwrite calling process
prbr: Allow write_filter to return value to qwrite calling process

The value will be returned as part of the qwrite_done message
after completion of the qwrite operation

scalaris-team/scalaris,scalaris-team/scalaris,scalaris-team/scalaris,jvf/scalaris,scalaris-team/scalaris,jvf/scalaris,scalaris-team/scalaris,scalaris-team/scalaris,jvf/scalaris,jvf/scalaris,jvf/scalaris,scalaris-team/scalaris,jvf/scalaris,scalaris-team/scalaris,jvf/scalaris