8067796: (process) Process.waitFor(timeout, unit) doesn't throw NPE if timeout is less than, or equal to zero when unit == null
Summary: Implement checking for NPE in Process implementation before other conditions
Reviewed-by: martin, chegar, aph, andrew

Reviewed-by: martin, andrew

Reviewed-by: dholmes, martin

Reviewed-by: kevinw, dholmes
Contributed-by: cheleswer.sahu@oracle.com

8047340: (process) Runtime.exec() fails in Turkish locale
Reviewed-by: coffeys, robm