Add enable-nfs-volume-service-credhub
Add enable-nfs-volume-service-credhub

[#164126115](https://www.pivotaltracker.com/story/show/164126115)

Signed-off-by: Sebastian Vidrio <68ba84219e4e2d7d15fed3ed668bd2821314e420@pivotal.io>

cloudfoundry/cf-deployment,cloudfoundry/cf-deployment