bump cfdot
bump cfdot

[finishes #158123378](https://www.pivotaltracker.com/story/show/158123378)

Submodule src/code.cloudfoundry.org/cfdot e72f99d3..e9aa29ab:
  > Dedup further events displayed by `cfdot lrp-events`

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