Localhost location: default to skipOnBoxBaseDirResolution=true

- moves SKIP_ON_BOX_BASE_DIR_RESOLUTION from
  MachineLifecycleEffectorTasks to BrooklynConfigKeys
Rename BrooklynMgmtContextUnitTestSupport

- to BrooklynAppUnitTestSupport
- and renamed BrooklynMgmtContextLiveTestSupport to
  BrooklynAppLiveTestSupport