keeping previous log format with microsecond
keeping previous log format with microsecond

[#157148730]

Co-authored-by: Nancy Hsieh <8e040521f8b99972eec33753d8eaeae295af11c5@pivotal.io>

cloudfoundry-incubator/cf-routing-release,cloudfoundry-incubator/cf-routing-release,cloudfoundry-incubator/cf-routing-release