JDK-8024935 Remove jasper-jtd compiler and replace it with ecj.

We should never have used jasper-jtd to begin with, jastow as always working with ecj.

This fixes JSP compiling issues on JDK8.
It addresses https://bugs.openjdk.java.net/browse/JDK-8024935

As a side note, we already use ecj directly in EAP for a while now.