RFR(M): 8059047: Extract parser/validator from jhat for use in tests

[Yekaterina Kantserova]

Hi,

Could I please have a review of this fix.

bug: https://bugs.openjdk.java.net/browse/JDK-8059047
webrev: http://cr.openjdk.java.net/~ykantser/8059047/webrev.00/

This fix is a part of JEP 241: Remove the jhat Tool 
(https://bugs.openjdk.java.net/browse/JDK-8059039). I suggest to put 
parser/validator into common test library since the functionality can be 
useful not only for SVC tools tests but even for some future GC tests.

The old jhat packages have been moved as follows:
com.sun.tools.hat.internal.model -> jdk.test.lib.hprof.model
com.sun.tools.hat.internal.parser -> jdk.test.lib.hprof.parser
com.sun.tools.hat.internal.util -> jdk.test.lib.hprof.util

The source has not been changed except Copyrights year.

Thanks,
Katja