Replace the 3 unix socket tests with real caps versions to demonstrate
that supported qemus no longer use the old syntax.
DO_TEST_CAPS_LATEST versions will be added later.
This also removes duplicate invocation of 'graphics-vnc-socket'.
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
