RFR 8042901: Allow com.sun.management to be in a different module to java.lang.management

[shanliang]

Please review this fix:

Bug: https://bugs.openjdk.java.net/browse/JDK-8042901
Webrev: http://cr.openjdk.java.net/~sjiang/JDK-8042901/00/

Some code within the module java.management is separated and moved to 
the new module jdk.management, the new module takes the implementation 
code for Oracle Corporation's platform extension to the implementation 
of the java.lang.management API and also the management interface for 
some other components for the platform.

Thanks,
Shanliang