msc: Use random chosen unused local TCP port number for SMPP client

The existing code passed -1 as TCP port number to the SMPP client.
This - very unintuitively - causes TITAN to always chose port number
9999, as that's the default value in IPL4asp.  Let's use '0' instead.

Change-Id: I4db38f4099c388bed23f9a3611619866ede9cbc5
1 file changed