Review Request : JDK-8031670: remove unneeded -source option from javadoc tests

[Neil Toda]

A small set of javadoc tests contain the -source parameter.  In most 
cases, the parameter is
not required for the test.  In several cases, the -source parameter is 
being explicitly tested,
but relies on a JDK version that will be removed from JDK9.

This changeset removes unnecessary -source specification when not 
needed, or changes the
test/source-version requested to one that will work in JDK9.

http://cr.openjdk.java.net/~darcy/neiltoda/8031670.0/

Thanks

-neil