aoip branch in openbsc.git

Hi Philipp, I have rebased the 'aoip' branch onto openbsc master. A test by the osmo-gsm-tester of this state was successful. Pending is to also verify voice and all of 3G still works there (will then update vlr_2G and vlr_3G branches). Some commits have been amended to, a) adjust libsmpp changes to use vlr_subscr, b) fix the msc_vlr unit tests after your rename of a_tx() and a_page() (don't really know why I didn't hit that earlier). c) add one comment So beware, if you rebase your most recent patches onto the 'aoip' branch, git may want to apply a few patches again because they slightly differ, even though their commit logs are identical. You need to sanity-check with 'rebase -i'. ~N