Consolidate NFS variables

Signed-off-by: Aram Price <aprice@pivotallabs.com>
Extract NFS or local blobstore setup

[#65775236]

Signed-off-by: Aram Price <aprice@pivotallabs.com>
Remove NFS setup changes used to work around linux container limitations.

These may need to be merged back in depending on how the bosh-lite team decides to proceed.

[#65775236]

Signed-off-by: Aram Price <aprice@pivotallabs.com>