RFR: JDK-8180318 Enable HTML 5 checking at compile time

Wed May 17 08:49:03 UTC 2017

JDK-8175036 enables HTML 5 when generating the API docs.

javac runs doclint at compile time, but remains configured for HTML 4. 
We should update the compilation steps to use HTML 5 except where 
exceptions are needed.

Note that two modules, java.base and java.desktop, is currently not 
fully html5 compliant, which generates warning which fails the build. In 
this patch, they have still html5 checking disabled.

Bug: https://bugs.openjdk.java.net/browse/JDK-8180318
WebRev: 
http://cr.openjdk.java.net/~ihse/JDK-8180318-enable-doclint-format-html5/webrev.01

/Magnus