fix pool timer leak bug, resolve#3353 (#3358)
fix pool timer leak bug, resolve#3353 (#3358)

When remove peer, block pool simple remove bpPeer,
but do not stop timer, that cause stopError for recorrected
peers. Stop timer when remove from pool.
tendermint/tendermint,tendermint/tendermint,tendermint/tendermint,tendermint/tendermint