RFR : JDK-8198552: Multiple javac plugins do not work at the same time.

[Jan Lahoda]

Hi,

When specifying multiple javac plugins using -Xplugin:, only one of them 
is run. The primary reason is that an incorrect (originally, there was 
only this one) method is overridden in Option.PLUGIN. I've found two 
more options that have the same problem ("-Xdoclint:" and 
"-Xdoclint/packages:"), I tried to fix those as well.

Bug: https://bugs.openjdk.java.net/browse/JDK-8198552
Webrev:
http://cr.openjdk.java.net/~jlahoda/8198552/webrev.00/

How does this look?

Thanks,
     Jan