system-test: Explicitly disable GridFTP 2 in tests

Different versions of globus-url-copy have different defaults for
GridFTP 2 support. This patch adds explicit arguments to the test
to disable GridFTP 2 in tests that are supposed to test GridFTP 1.

Target: trunk
Require-notes: no
Require-book: no
Acked-by: Paul Millar <paul.millar@desy.de>
Patch: http://rb.dcache.org/r/6714/