autotools: Modernize o.e.cdt.autotools.tests bundle. (take 2)

* Bump BREE to Java 1.8.
* Start using lambdas.
* Removed unused helper methods/activator/etc.
* More JUnit 4 migration.
* Enable more warnings by default and fix them.


Change-Id: If2df6114fb18b66822849ce2e1b956dd0ce6b514
Signed-off-by: Alexander Kurtakov <akurtako@redhat.com>
20 files changed