7021006: (process) Remove disabled clone-exec feature
Summary: Remove clone implemention on Unix
Reviewed-by: martin, alanb, dholmes

8071481: (Process) Merge UNIXProcess.java into ProcessImpl.java
Summary: simplify source files for Unix Process implementation
Reviewed-by: plevart, chegar

8054834: Modular Source Code
Reviewed-by: alanb, chegar, ihse, mduigou
Contributed-by: alan.bateman@oracle.com, alex.buckley@oracle.com, chris.hegarty@oracle.com, erik.joelsson@oracle.com, jonathan.gibbons@oracle.com, karen.kinnear@oracle.com, magnus.ihse.bursie@oracle.com, mandy.chung@oracle.com, mark.reinhold@oracle.com, paul.sandoz@oracle.com