Merge remote-tracking branch 'origin/pr/179'

* origin/pr/179:
  NetworkManager config - Add dns=default

network/qubes-fix-nm-conf.sh

@@ -16,4 +16,7 @@ fi
 if ! grep -q "^unmanaged-devices.*$VIFMAC" $FILE ; then
 	sed -i 's/^unmanaged-devices.*$/&,'$VIFMAC/ $FILE
 fi
+if ! grep -q "^dns=" $FILE ; then
+	sed -i '/\[main\] a dns=default' $FILE
+fi
 exit 0