Update nfsbrokerpush/start.sh.erb tests for credhub link changes
Update nfsbrokerpush/start.sh.erb tests for credhub link changes

[#161992826](https://www.pivotaltracker.com/story/show/161992826)

Co-authored-by: Julian Hjortshoj <a84af1ff40fcfa3bc4844358f827e17a8b38c426@emc.com>

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