Add CommonTest to help to write Integration tests

Add a CommonTest class which extends BaseTest of osgi-helpers bundle.
CommonTest initialize the FuchsiaHelper, add the Fuchsia and assertj bundles to
configuration. Enable by default the mockitos bundles.

All the Integrations test of Fuchsia has been changed to extend CommonTest
instead of BaseTest.
Fix DiscoveryTest in fake-it module
Fix visbility problem in DeclarationBuilder

Innner classes Value and ExtraValue are now public.
Add integration test to AbstractDiscoveryComponent
Clean pom.xml of fuchsia-parent

Some cleaning, update maven profiles and more.