Feature request: allow to make last writer also reader if it's only node left

[markusalbe]

Would be great to have --writer_is_also_reader=2 so if writer is only surviving node in a cluster, it would act as a reader too until other node shows up to act as a reader.

[Tusamarco]

@markusalbe to be clear. You want to have the Writer completely excluded by reads operation (not even 1 read) , and when all nodes are not in then use it. Is not enough to define a very low weight in the special 8xxx group that handle the readers.
Correct?