RFR JDK-8198253: ThreadInfo.from(CompositeData) assigning fields incorrectly in JDK 9

[mandy chung]

Webrev at:
   http://cr.openjdk.java.net/~mchung/jdk11/webrevs/8198253/webrev.01

This patch updates the spec to clarify what attributes are required
since which release.  There is a spec bug that "classLoaderName"
added in JDK 9 is missing in the CompositeData for StackTraceElement
but the implementation is correct.  I will file a CSR for this update.

This patch ensures that CompositeData for ThreadInfo of version N
must have the attributes defined since <= N.
ThreadInfo::from also makes sure 'stackTrace' and 'lockedMonitors'
attributes of version N while it can include additional attributes
which has been the current behavior.

JDK-8139587 intended to support older versions of StackTraceElement
which does not seem a complete solution.  I reverted the fix for
JDK-8139587 (mostly) and removed TypeVersionMapper.  The fix constructs
the CompositeType for ThreadInfo and MonitorInfo of different
versions and used them for validation.  Minor cleanup: the static
final variables are renamed to all capitals.  CompatibilityTest.java
test is missing the copyright header.

thanks
Mandy
[1] http://cr.openjdk.java.net/~mchung/jdk11/webrevs/8198253/api/java/lang/management/ThreadInfo.html#from(javax.management.openmbean.CompositeData)

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