Move the EDP examples from the sahara-extra repo to sahara

Moving the Sahara EDP examples from the sahara-extra repo to
the sahara repo accomplishes several things:

* It eliminates code duplication since the examples are actually
  used in integration tests
* It removes an element from the sahara-extra repo, thereby moving
  us closer to retiring that repo and simplifying our repo structure
* It puts examples where developers are more likely to find it, and
  makes it simpler to potentially bundle the examples with a Sahara
  distribution

blueprint edp-move-examples
Change-Id: I58e2b1ca9e975dcf414525efe187314747c5d90b