Add and use compatible scenario when testing IPA dynts with nanoBTS

nanoBTS doesn't support SDCCH8 in TS!=1 according to osmo-bsc code.
Let's use in this case TCH/H to make sure they are not used for the test
(since we require osmo-bsc to use full rate codecs for the call).

Change-Id: I37f3fe813d4074fbfe64ff3176048e7d25d470e2
2 files changed