Bug 946311 - 1/N: don't mix cid with the index to data_context array.
Bug 946311 - 2/N: fix AT+CGDCONT implementation
Bug 946311 - 3/N: intantiate additional rmnet nics.
Bug 946311 - 4/N: support link down for SMC91C111
Bug 946311 - 5/N: link up/down in AT+CGACT handler.
Bug 946311 - 6/N: implement AT+CGCONTRDP.