kernelupload: Revive upload support check

Needed so that test_urls doesn't fail attempting to upload

virtinst/kernelupload.py

@@ -121,6 +121,11 @@ def upload_kernel_initrd(conn, scratchdir, system_scratchdir,
                       " nothing to upload")
         return kernel, initrd, tmpvols
 
+    if not conn.support_remote_url_install():
+        # Needed for the test_urls suite
+        logging.debug("Media upload not supported")
+        return kernel, initrd, tmpvols
+
     # Build pool
     logging.debug("Uploading kernel/initrd media")
     pool = _build_pool(conn, meter, system_scratchdir)