RFR 8043138: Attach API should not require jvmstat rmi protocol

[Jaroslav Bachorik]

Please, review the following change

Issue : https://bugs.openjdk.java.net/browse/JDK-8043138
Webrevs:
* top level: http://cr.openjdk.java.net/~jbachorik/8043138/webrev.00/top
* jdk: http://cr.openjdk.java.net/~jbachorik/8043138/webrev.00/jdk

This patch splits up the jdk.jvmstat module to jdk.jvmstat and 
jdk.jvmstat.rmi to make the basic jvmstat functionality available 
without requiring dependencies on RMI.

The split is pretty straightforward - all the RMI dependent 
implementation is moved to the new module as well as 'jstatd' 
implementation.

The change requires changes in the makefile (for merging 
META-INF/services resources from jdk.jvmstat and jdk.jvmstat.rmi) and 
therefore I am posting this request also to the build-dev mailing list.


Thanks,

-JB-