Optimize p2p transfer business layer logic (#501)

Optimize p2p transfer business layer logic (#501)

* Optimize p2p business layer logic

* Merge dev branch code

* Fix new mined block can't broadcast error

* Remove unused test file

* Del unused parameter

* Add RWMutex

* Add sent message filter

* Fix request block quite bug

* Del unused function BroadcastToPeers

* Fix new peer channel bug

* Del chainHeight from blockKeeper

* Fix sync check logic bug

* Add business protocol handshake

* Del unused code

* Optimize code format

* Del unused function

* Refactor request block by hash/height function

* Refactor tx notify handle

* Refactor BlockRequestWorker to sequential process

* Fix net bestheight error

* Refactor p2p net sync code

* Refactor p2p net sync code

* Refactor BlockRequestWorker of blockkeeper

* ValidateTx return orphan flag

* For p2p transfer test

* For p2p transfer test

* Check exist block whether orphan

* Enable peer exchange function default

* Add txpool sync when new peer connected

* Fix golint check error

* Change mine difficulty

* Fix requst genesis block bug

* Fix address compare function

* Fix blockrequest bug

* Revert "For p2p transfer test"

This reverts commit e6a36d86d5077f6c520dbfbb6eee2ab4335012e5.

* Fix request block bug

* For test

* Fix code review problem

* Optimize log printing

* Fix ci check error