osbase: move test packages under osbase/test

The cmd, freeport and socksproxy packages are only used in tests, and
are also intended to be only used in tests. This change moves these
packages under osbase/test.

Change-Id: I8fe679945990c295bdf822abfce56c25233c4588
Reviewed-on: https://review.monogon.dev/c/monogon/+/4564
Reviewed-by: Tim Windelschmidt <tim@monogon.tech>
Tested-by: Jenkins CI
diff --git a/osbase/test/qemu/launch.go b/osbase/test/qemu/launch.go
index ba33961..a427f17 100644
--- a/osbase/test/qemu/launch.go
+++ b/osbase/test/qemu/launch.go
@@ -21,7 +21,7 @@
 	"github.com/bazelbuild/rules_go/go/runfiles"
 	"golang.org/x/sys/unix"
 
-	"source.monogon.dev/osbase/freeport"
+	"source.monogon.dev/osbase/test/freeport"
 )
 
 var (