* This changes bss_patch_filter_msg to return -1 or BSS_FILTER_DTAP
for DTAP messages. This way app_forward_sccp should continue to behave
the same besides now looking into DTAP messages.
* Introduce a direction in case we want to advertize FR into the BSS
side and HR into the other direction.
* Patch AMR HR3 and Fullrate/Halfrate capabilities in the Bearer
Capabilities. Add a test case that is patching the bearer capabilities