qemuxml2argvtest: Add test cases covered only by qemuxml2xmltest - part 2

qemuxml2argvtest: Add test cases covered only by qemuxml2xmltest - part 2

Add the rest of test cases which were tested only by qemuxml2xmltest.

All test cases added here have a '<interface type="network"' which needs
to be translated using the new fake network driver.

Note that this captures the status quo of the tests. No care was given
whether the tests make sense.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>