Bug 518587 - Modernize o.e.equinox.p2.tests

Move to Java 8, enable more warnings and save actions and go through the
codebase to minimize the warnings.

Change-Id: I6283bfeef18e250f5283e80f7bfad38e6ef65415
Signed-off-by: Alexander Kurtakov <akurtako@redhat.com>
314 files changed