RFR: 8218913: Rename --strip-debug jlink plugin

[Severin Gehwolf]

Hi,

As discussed in the RFR thread for JDK-8214796 it was suggested to
rename the --strip-debug plugin so that --strip-debug could actually
perform java debug symbols stripping *and* native debug symbols
stripping at once. That's what this patch does. It renames --strip-
debug to --strip-java-debug-symbols and --strip-debug just calls --
strip-java-debug-symbols behind the scenes.

Note that --strip-debug-attributes as name would work for me too, but
given that we are about to introduce --strip-native-debug-symbols,
having the java strippping plugin with a similar name made sense to me.

bug: https://bugs.openjdk.java.net/browse/JDK-8218913
webrev: http://cr.openjdk.java.net/~sgehwolf/webrevs/JDK-8218913/01/webrev/

Testing: jlink/jimage tests and jdk/submit (currently running).

Thoughts?

Thanks,
Severin