From Olivier Jacques:

From Olivier Jacques:
- to_str.c: add support of "AT_NONE" address type in address_to_str_buf (avoid the assert failed later on
when messages have address type of AT_NONE - which can be the case for an MTP2 capture with FISU messages)
- packet-isup.c: changed source and destination addresses from (net_src and net_dst) to (src and dst) so
that addresses taken into account in the statistics are the SS7 point codes

svn path=/trunk/; revision=17720