Unit tests are failing on vaadin8 branch

[nomukaiki]

Results :

Failed tests:   ui_scopes_should_not_overlap_in_same_session(com.vaadin.guice.server.UIScopeTest): Values should be different. Actual: com.vaadin.guice.testClasses.UIScoped1@1d2bd371
  ui_scopes_should_not_overlap_in_different_sessions(com.vaadin.guice.server.UIScopeTest): expected:<com.vaadin.guice.testClasses.UIScoped2@4cf8b2dc> but was:<com.vaadin.guice.testClasses.UIScoped2@708400f6>

Tests run: 13, Failures: 2, Errors: 0, Skipped: 0

[berndhopp]

fixed