When printing a list of link-layer types for -L, give the name of the
device for which they're being reported, so if no -i flag was given
people don't think it's something such as the union of of all link-layer
types supported by all devices, and, if we can determine whether the
device supports monitor mode (with libpcap 1.0.0 and later), indicate
whether the link-layer types are the ones supported when not in monitor
mode (if -I wasn't specified) or when in monitor mode (if -I was
specified), so people don't wonder why some types aren't available (as
some are available only in monitor mode, and others are available only
when not in monitor mode, on some platforms).
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