bump persi-acceptance-tests
bump persi-acceptance-tests

Submodule src/code.cloudfoundry.org/persi-acceptance-tests e15658a..08a6285:
  > delete file after reading [#136218413](https://www.pivotaltracker.com/story/show/136218413)

Signed-off-by: Jeff Pak <9d750c79dc1952140f693c4bda214b11dba3d64d@emc.com>

cloudfoundry-incubator/cephfs-bosh-release,cloudfoundry-incubator/cephfs-bosh-release