8169344: Potential open file descriptor in exists() of hotspot/agent/src/os/bsd/ps_core.c
Summary: Use access() instead of open() to check for the existence of a file
Reviewed-by: dsamersoff, dholmes
Contributed-by: jini.george@oracle.com

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