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It is now possible to specify -2 (BELLE_SIP_LISTENING_POINT_DONT_BIND) to request no server socket to be created.
This removes the need for the build-time ENABLE_SERVER_SOCKET option.

fix double unref of channel resolver, clean code that set an object name to the resolver since it is now done internally.

Improve refresher behavior (fixes crashes)

fix security issue resulting in cn-mismatch not detected with mbedtls. Requires bctoolbox upgrade to 0.4.0.

add new parameter to refresher's listener to indicate if the refresher is going to retry the request.

UDP channel wasn't failing to send an IPv6 packet if IPv6 is not available. This is now fixed and allows fallback to ipv4.

This reverts commit f1a5d04d.

# Conflicts:
#	src/belle_sip_internal.h
#	src/belle_sip_utils.c