explicit shellwords require

Signed-off-by: Johannes Petzold <jpetzold@pivotal.io>
Bump nsync, runtime-schema

[delivers #80422218]

Bump cloudfoundry-incubator/nsync:
  Alex Suraci:
     only one listener operates at a time ( Travis Success: https://travis-ci.org/cloudfoundry-incubator/nsync/builds/37632678 )
Bump cloudfoundry-incubator/runtime-schema:
  Alex Suraci:
     add nsync listener lock ( Travis Success: https://travis-ci.org/cloudfoundry-incubator/runtime-schema/builds/37632714 )