Add inet6 keyword if it wasn't specified in ifconfig_IF_ipv6 line (assume that we really want IPv6 address if we specified _ipv6 prefix).
You may want to check for ^[[::blank:]]*inet6 or similar to not annoy
people who have a whitespace there.
For bugs matching the following criteria:
Status: In Progress Changed: (is less than) 2014-06-01
Reset to default assignee and clear in-progress tags.
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