Changes

WIP to support Jetty 9 and 10

- Move org.eclipse.userstorage.tests from using Require-Bundle to
  import-package
- Remove use of deprecated Jetty logger; tests show Jetty output,
  but that is actually useful

- added new .target for eclipse-latest, orbit-latest, and jetty 10
  for configuring Eclipse
- added new profiles to build and test for other named Eclipse releases

    mvn -Declipse.target=neon verify

  or use the following to test with Jetty 10

    mvn -Declipse.target=latest verify

todo:
- tests failing trying to connect to USSServer: connections are
  immediately dropped

Change-Id: I385b9c883bc4615e372a08238a2a158010368825
Signed-off-by: Brian de Alwis <bsd@acm.org>