update nfs-volume-release README.md to replace old deployment instructions with new bosh v2 ones [#152651783](https://www.pivotaltracker.com/story/show/152651783)
update nfs-volume-release README.md to replace old deployment instructions with new bosh v2 ones [#152651783](https://www.pivotaltracker.com/story/show/152651783)

cloudfoundry-incubator/nfs-volume-release,cloudfoundry-incubator/nfs-volume-release,cloudfoundry-incubator/nfs-volume-release