Create etc/edp-examples directory

Merge content from sahara-extra/edp-examples and integration/tests/resources
into one directory under etc/edp-examples. This is part of the effort to
ultimately move edp-examples out of the sahara-extra repo and eliminate duplication.

The integration tests have been changed to reference the new
etc/edp-examples directory, and an EDPJobInfo class has been added to
eliminate path and config value duplication between the tests.

Partial-implements: blueprint edp-move-examples
Change-Id: I71b3cd21dcb9983fd6284a90316b12368481c700