bump nsync
bump nsync

[finishes #110676966]

Submodule src/github.com/cloudfoundry-incubator/nsync 2920fae..47675a2:
  > Merge branch 'sshd-single-to-double-quote'

Signed-off-by: Nick Calugar <3c1e5caf264206c462dfd677807c430d59fb30df@pivotal.io>

cloudfoundry-incubator/diego-release,cloudfoundry-incubator/diego-release,cloudfoundry-incubator/diego-release,cloudfoundry-incubator/diego-release