[HTTPConnectionPool] Fix timer action races#434
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Motivation
We have a race between some actions created in the state machine under the
stateLockand their implementation in theHTTPConnectionPool.Changes
_idleTimerand_backoffTimerare protected bystateLockstruct Actionsthat splits up actions from the state machine into actions that need to be executed inside thestateLockand outside instateLockResult
No more races in timer scheduling.