[AFS3-std] Port numbers for AFS+OSD

[Felix Frank]

The additional ports used for the current RxOSD implementation are 7011
for the rxosd server and 7012 for the OSDDB database server. These are
inherited from the now obsolete MR-AFS branch. Historically, RxOSD and
MR-AFS would even coexist in the same cell.

Sadly, these ports are no longer available for registration with IANA. I
suggest to use them anyway, as they are (via MR-AFS) historically linked
to AFS and fit intuitively with the other ports used by AFS (which is a
convenience bonus for network administrators). A request to IANA would
likely yield obscure ports that won't be as easily recognized as part of
AFS.

Regards
 - Felix