bump switchboard
bump switchboard

Submodule src/github.com/cloudfoundry-incubator/switchboard 74351e3..27ee277:
  > Remove data races in cluster/monitor test

Signed-off-by: Chris Hendrix <f9e38fc3e1ff46784bdcadbf77d17f93932faf2c@pivotal.io>

cloudfoundry/cf-mysql-release,cloudfoundry/cf-mysql-release,cloudfoundry/cf-mysql-release,cloudfoundry/cf-mysql-release