add print wallet after open wallet

add buffer time when sync block

MNT:

1. fix some transaction error;
2. change gateway
3. merge some new changes based on v0.2.9

fix channel peer

Merge remote-tracking branch 'origin/trunk' into trunk

change verson to v0.2.7

REVERT: cancel workaround. Id: f0a1b49

modify

add trinity image

ADD: add one rpc interface for spv