ASACORE-1195: Thin Core Library MCast6Up fails

Fix mDNS multi-homed implementation for Windows. Must re-write
contents of outgoing discovery packet with actual interface and
listening port for each interface.

Signed-off-by: Peter Krystad <pkrystad@qce.qualcomm.com>
Change-Id: Iddba7e1774be3e9398af2f0d14fe8d15bac96d90
Merge "ASACORE-1195: Thin Core Library MCast6Up fails" into RB14.12