cnat: maglev fixes & improvements

This fixes the maglev logic which previously
included a wrong simplication.
It moves the maglev logic to its own file,
and adds a test function in the debug cli.

Type: improvement

Change-Id: I2790ae2a26fc1c5739ff02f41d436bfcafd5b380
Signed-off-by: Nathan Skrzypczak <nathan.skrzypczak@gmail.com>

src/plugins/cnat/cnat_types.h

@@ -62,6 +62,8 @@ typedef enum cnat_trk_flag_t_
   /* Don't translate this endpoint, but still
    * forward. Used by maglev for DSR */
   CNAT_TRK_FLAG_NO_NAT = (1 << 1),
+  /* */
+  CNAT_TRK_FLAG_TEST_DISABLED = (1 << 7),
 } cnat_trk_flag_t;
 
 typedef enum