Add new flag `-h', which when set indicates that the last argument is the hostname, which we should resolve to get actual IP address(es) for the destination. Make it mostly IP4/6-version-agnostic, we still need to supply proper logic for the IPv6 case and test it.
Add new flag `-h', which when set indicates that the last argument is the
hostname, which we should resolve to get actual IP address(es) for the
destination. Make it mostly IP4/6-version-agnostic, we still need to supply
proper logic for the IPv6 case and test it.

synety-jdebp/rtpproxy,dsanders11/rtpproxy,synety-jdebp/rtpproxy,sippy/rtpproxy,jevonearth/rtpproxy,sippy/rtpproxy,synety-jdebp/rtpproxy,sippy/rtpproxy,dsanders11/rtpproxy,jevonearth/rtpproxy,jevonearth/rtpproxy,dsanders11/rtpproxy,synety-jdebp/rtpproxy,jevonearth/rtpproxy