Convert three register flags to type flagx.StringFile #57
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We are working on having M-Lab managed VMs leverage the Autojoin API in order to get a dynamic DNS name. The value of several of the flags to the
register
command are already present on the local filesystem of our VMs in the /var/local/metadata directory. Namely, external IPv4 and IPv6 addresses and the IATA code for the site. This PR coverts the-iata
,-ipv4
and-ipv6
flags to be of type flagx.StringFile, which allow us to specify a path to a file instead of a static string value for these flags.This change is