add cvcap user to fuse group [#138373855](https://www.pivotaltracker.com/story/show/138373855)
add cvcap user to fuse group
[#138373855](https://www.pivotaltracker.com/story/show/138373855)

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