bump nsync
bump nsync

[finishes #106517944]

Submodule src/github.com/cloudfoundry-incubator/nsync 79f6383..2ec3976:
  > Mark domains as freesh even in face of an invalid LRP

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