=pro load sample builds with project dependencies

* load sample builds from their definitions and replace library dependencies with project ones
* remove redefined sample build definitions
* test osgi sample by running a maven command

This unblocks #16096 because after SBT 0.13.6 project definitions defined in sbt files take precedence over same projects defined in ```... extends Build {}``` definitions. This prevents us redefining sample build definitions in `AkkaBuild.scala`.

OSGi dining hakkers is tested by running maven command. I tried to write `.sbt` files for that sample but was hit by various OSGi related errors when running tests. Therefore I delegated for maven to do all the work.

This is one more step to the direction of #15863 and #15031.
So this seems to be missing now. If I only run `akka-sample-osgi-dining-hakkers/test` how do you make sure that it actually tests with the right snapshot things (the ones that should be built from the code that you are working on) since the test will use maven.