remove unnecessary mkdir of voldriver discovery path from rep ctl script [#149588097](https://www.pivotaltracker.com/story/show/149588097)
remove unnecessary mkdir of voldriver discovery path from rep ctl script
[#149588097](https://www.pivotaltracker.com/story/show/149588097)

cloudfoundry-incubator/diego-release,cloudfoundry-incubator/diego-release,cloudfoundry-incubator/diego-release,cloudfoundry-incubator/diego-release