Removed tag rabbitmq_v3_0_1
Added tag rabbitmq_v3_0_1 for changeset 91df77f12b7f
Changelogs for 3.0.1.
Merge heads
make sure the stats and rate timers don't keep each other alive
Reminder
Merge bug25353
stable to default
get rid of bump_reductions
it hurts performance in some cases and credit_flow does a better job
replace credit_flow:update/3 with a macro
un order to eliminate closure creation and thus improve performance.

Also...
- get rid of a 'get/2' call by processing result of 'erase' instead
- inline remaining get/2 calls for performance
create branch
merge bug25363 into bug25365
only invoke control_throttle when necesseary
get rid of rabbit_channel MASKED_CALL macro
which simplifies the code and eliminates a performance hotspot
merge bug25365 into bug25367
make reader react to flow control sooner
...by blocking when encountering content headers/body frames, rather
than method frames of content-bearing commands.
move a bunch of reader state fields into 'connection'
These fields are constant, seldom read, and associated with the
connection.
Also, move #connection definition from rabbit.hrl to rabbit_reader -
nothing else is using this and it is really private to the reader.
move some more reader state into #connection
and also clear auth_state once auth has been completed, so we don't
hang on to some potentially large piece of state.
move throttle related reader state into sub-state
optimise rabbit_channel:process_routing_result/6
- put most common clause first
- inline record_confirm/3