DERBY-6078: Propagate a set of properties to the junit tasks in build.xml

Command line properties are now propagated to the JUnit tasks in build.xml.
Added to be able to specify properties controlling Derby or test behavior
when invoking ant (i.e. ant -Dderby.tests.trace=true junit-all).

Patch file: derby-6078-1a-cmdline_property_passing.diff


git-svn-id: https://svn.apache.org/repos/asf/db/derby/code/trunk@1448359 13f79535-47bb-0310-9956-ffa450edef68