Bring the coverage analysis of the unit test suite back into a runnable state.

It seems that my system upgrade a few weeks ago (which changed the default JVM from 8 to 9)
has made jcov unhappy.  I'm adding a reference to JAVA_HOME, so that I can (temporarily!)
force Java 8 until I figure out what to do about jcov and Java 9.

Also disabling the 2nd run (under server local locale) because jcov seems unhappy about
that, too, at the moment, for reasons that remain unclear.

This change should bring things back to a runnable state.