bump file-server nsync runtime-schema stager

Submodule src/github.com/cloudfoundry-incubator/file-server 35ab886..31331b2:
  > switch to rata
Submodule src/github.com/cloudfoundry-incubator/nsync bb3f875..2d4312f:
  > use rata for file server
Submodule src/github.com/cloudfoundry-incubator/runtime-schema c803d0c..e8a5b5b:
  > move file server to rata; kill old router
Submodule src/github.com/cloudfoundry-incubator/stager f67defd..ddfa05f:
  > use rata for file server

Signed-off-by: Kris Hicks <krishicks@gmail.com>
bump converger executor

Submodule src/github.com/cloudfoundry-incubator/converger 0772288..190f77d:
  > remove flaky converger test
Submodule src/github.com/cloudfoundry-incubator/executor 8ed5827..5a034fb:
  > sorry alex, i got rid of abit

Signed-off-by: Kris Hicks <krishicks@gmail.com>