bump switchboard
bump switchboard

Submodule src/github.com/cloudfoundry-incubator/switchboard 620fa2d..08efafc:
  > Log some of the more noisy log statements at DEBUG rather than INFO

Signed-off-by: Rob Dimsdale-Zucker <4df639ba78cac7f8d741d02ef508f2611d6911dd@pivotal.io>

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