Use experimental "_ A" minimization in relaxed mode.

qname minimization, even in relaxed mode, can fail on
some very broken domains. In relaxed mode, instead of
asking for "foo.bar NS" ask for "_.foo.bar A" to either
get a delegation or NXDOMAIN. It will require more queries
than regular mode for proper NXDOMAINs.

bin/tests/system/conf.sh.common

@@ -21,7 +21,7 @@ else
 	TESTSOCK6=false
 fi
 
-TESTSOCK6="$TESTSOCK6"
+export LANG=C
 
 . ${TOP}/version