8152435: (CL)HSDB should be started with no argument
Reviewed-by: dsamersoff

8151709: jhsdb should show help message in SALauncher.
Reviewed-by: dsamersoff

8067194: Restructure hotspot/agent/src to conform the modular source layout
Summary: Move sources under jdk.hotspot.agent
Reviewed-by: ihse, erikj, jbachorik