Add symlink to ports tree, which we put in /usr/testbed cause

/usr is kinda small as it is.

install/phases/ops/genirack

@@ -148,6 +148,9 @@ sub Install($$$)
 	    DoneIfExists("$PREFIX/ports/Mk");
 	    ExecQuietFatal("cd $PREFIX; $TAR zxf $PREFIX/ports.tar.gz");
 	};
+	Phase "portlink", "Linking to unpacked ports tree", sub {
+	    ExecQuietFatal("cd /usr; ln -sf testbed/ports .");
+	}
 	
 	Phase "rcconf", "Updating rcconf for actual boot", sub {
 	    my @strings = ();