Review Request: JDK-8173608: Separate JDK management agent from java.management module

[Mandy Chung]

java.management is the module for JMX and JMX remote API and
java.lang.management. JDK management agent provides the JDK-specific
out-of-the-box monitoring and management support and it’s cleaner
for it to live in its own module.  It is proposed to move it
to a new module named `jdk.management.agent`.

This change involves:
1) renaming of sun.management.Agent along with 3 other classes
in sun.management package to jdk.internal.agent package

2) move sun.management.resources to jdk.internal.agent.resources

3) move sun.management.jmxremote and sun.management.jdp packages
to jdk.management.agent module

4) move the configuration files under conf/management

5) sun/management/jmxremote/ConnectorBootstrap.java is updated
to replace the use of the ClassLogger API with System.Logger.

6) change hotspot VM to add `jdk.management.agent` when 
-Dcom.sun.management.* system property is set as well as
the Agent class rename 

Daniel is working on JDK-8173607 [1] that conflicts with this
patch and require merges/coordination.

We propose to integrate these changes to jdk9/dev unless
there is any objection concerning that this trivial hotspot change
might cause any issue.  I have submitted a RBT on hotspot_runtime
and hotspot_serviceability in addition to PIT test runs.

thanks
Mandy
[1] https://bugs.openjdk.java.net/browse/JDK-8173607