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/metropolis/test/nanoswitch/socks.go b/metropolis/test/nanoswitch/socks.go
index 15e0f81..41efcde 100644
--- a/metropolis/test/nanoswitch/socks.go
+++ b/metropolis/test/nanoswitch/socks.go
@@ -8,8 +8,8 @@
 	"fmt"
 	"net"
 
-	"source.monogon.dev/osbase/socksproxy"
 	"source.monogon.dev/osbase/supervisor"
+	"source.monogon.dev/osbase/test/socksproxy"
 )
 
 // SOCKSPort is the port at which nanoswitch listens for SOCKS conenctions.