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removed session id user completely from providerquerymanager

Integrate the ProviderQueryManager into the SessionPeerManager and bitswap in general

re #52, re #49

Improve stability of tests for Session and SessionPeerManager

fix #61

Also, buffer single-use channels we may walk away from. This was showing
up (rarely) in a go-ipfs test.

Remove sync.waitGroup in SessionPeerManager till it's needed

when providers are found in a session, explicitly connect them so they get added to the peer manager

fix #53

Encapsulate functions for readability, and move code for understanding

Reduce duplicates through splits of requests

Order optimized peers by most recent to receive a block

fix #43

Add unit test for sessionpeermanger and comment exported methods

extract the job of finding and managing peers for a session from the job of requesting blocks