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same as nsqio/pynsq#98 in anticipation of nsqio/nsq#404 landing
this changes
Consumer
from asynchronous -> synchronousRDY
handling in order to strongly order the commands sent over the
wire.
the meaningful change is that we now send
RDY
beforeFIN
/REQ
to ensure that we only ever test the water with a single message
when in backoff.
cc @jehiah