Add advertising address support

Adapted from https://github.com/miconda/rtpproxy/commit/41f6d9d9084a6fad52a6483a0593d4b25e0de8ca
Merge branch 'rtpp_1' of https://github.com/taisph/rtpproxy into tarnish/rtpp_1

Conflicts:
	rtpp_command.c
	src/main.c
Merge branch 'rtpp_1' of https://github.com/taisph/rtpproxy into tarnish/rtpp_1.