Changes

mgcp-cli: Fix filling in wrong local IP address of SDP Origin o=

If user (VTY) configured the local IP address to use for MGCP, and that
IP address was not the one selected by kernel routing table lookup, the
IP address filled in the MGCP message would be wrong, not matching the
one sending the MGCP message.

Change-Id: I35624db853dc1f0fee85503105960613f70473c6