Simplify bn2vch using int.to_bytes
Simplify bn2vch using int.to_bytes


Former-commit-id: b58662bda794ce0ddb307e5eec1b631f404805a7
syscoin/syscoin,syscoin/syscoin2,syscoin/syscoin,syscoin/syscoin2,syscoin/syscoin2,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin2,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin2,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin2