fus: List lookaside repos first

This works around a bug where fus prioritizes first repo and thus could
include packages even if they were in lookaside.

Signed-off-by: Lubomír Sedlář <lsedlar@redhat.com>

tests/test_fus_wrapper.py

@@ -37,10 +37,10 @@ class TestGetCmd(unittest.TestCase):
                 "--verbose",
                 "--arch",
                 "x86_64",
-                "--repo=repo-0,repo,/tmp/first",
-                "--repo=repo-1,repo,/tmp/second",
                 "--repo=lookaside-0,lookaside,/tmp/fst",
                 "--repo=lookaside-1,lookaside,/tmp/snd",
+                "--repo=repo-0,repo,/tmp/first",
+                "--repo=repo-1,repo,/tmp/second",
                 "--platform=f29",
                 "module(mod:1.0)",
                 "pkg",