INET now part of Big8

As part of the hand-off of n.a.n from tale to a triumvirate, INET groups will now be considered part of Big8. To quote:

[...] every site we're familiar with has chosen to just carry all of the INET groups as well as the regular Big 8 groups. The only canonical list of Big 8 groups that has been available for the past year or so, the active group list on ftp.isc.org, has included the INET groups. In short, the distinction no longer seems to serve any purpose, particularly compared to the advantages of issuing checkgroups control messages.

Therefore, future Big 8 checkgroups control messages will include INET groups.