set default values for pats env variables
set default values for pats env variables

Signed-off-by: Paul Warren <381ebbe39e97b92332c450533d9eabb9a873db86@emc.com>

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