Review request: 8029548 (jdeps) use @jdk.Exported to determine supported vs JDK internal API

[Mandy Chung]

This patch is also intended to target for 8u40 backport.  It fixes
the following issues:

JDK-8029548 (jdeps) use @jdk.Exported to determine supported vs JDK internal API
JDK-8039007 jdeps incorrectly reports javax.jnlp as JDK internal APIs
JDK-8031092 jdeps does not recognize --help option.
JDK-8048063 (jdeps) Add filtering capability

Webrev at:
   http://cr.openjdk.java.net/~mchung/jdk9/webrevs/8029548/webrev.00/

jdeps will determine if it's a JDK internal API by checking the @jdk.Exported.
It also reads tools.jar and flags if they are non-exported.  javax.jnlp is
supported API but not annotated with @jdk.Exported and so we special case
it as a workaround. A new -filter option is added to provide an easy
way to do filtering e.g. -filter java.lang.*, -filter:archive to filter
out all dependences from the same archive (i.e the input JAR file or
directory).  The default is changed to filter out the dependences
within the same package.  I also have cleaned up and refactored some code
between JdepsTask and Analyzer to prepare for source restructuring
and modularization work.

thanks
Mandy