Define a default master server list for the root zone
To minimize the effort required to set up IANA root zone mirroring, define a default master server list for the root zone and use it when that zone is to be mirrored and no master server list was explicitly specified. Contents of that list are taken from RFC 7706 and are subject to change in future releases. Since the static get_masters_def() function in bin/named/config.c does exactly what named_zone_configure() in bin/named/zoneconf.c needs to do, make the former non-static and use it in the latter to prevent code duplication.
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