* terror: replace sirupsen/logrus by pingcap/log also fixed test failure on Windows * circle.yml: restrict test parallelism in integration tests also, stop verifying parser.go and code format in the integration tests... those steps are redundant. * codecov: add codecov.yml, based on pingcap/tidb#9618 Co-authored-by: tiancaiamao <tiancaiamao@gmail.com>