Update the server-to-server communication section

Give better overviews in more appropriate locations.
Move the motivation for some VL_RegisterAddrsAndKey into the
section about declaring rxgk support, and the API restrictions
on it into the section with the RPC-L.

Don't duplicate the statement that rxgk's security index is 4.

Specify only that confidentiality protection is required; it is
not necessary to call out rxkad specifically as unusable.

Change-Id: I8993d305c8462cfeaee75fb85ccfe27ac6f16e5d
Add in RFC 4402 PRF+ editorial note

Copied from the core document verbatim.

Change-Id: Iccdb485395413564c9440cbe9b7327f305aabeeb
Updates for SetCallBackKey

Mostly just adapting to the new token format.

Change-Id: If881b8c7d1cdc15e80f08eaafc8ed065e19c15f8
Don't request PRAUTHTYPE_EMPTY anymore

Change-Id: Icffdbd9c7161f76538fc2292a76b8488e33dc568
security consideration for callback key DoS

Change-Id: If4c6a30c7b5a5937184fb16fa3d0bcd3d29acbb8
Add guidance for keying departmental fileservers

Since they need GSS credentials to do their thing.

Change-Id: I596ba7e5acff312924c71072ac037dd53d75773c
It's cb_id, not cm_id

The identities from a cm_tok go into a cb_id field.  There is
neither a cm_id nor a cb_tok.

Change-Id: I77358b28089eac2c1a002be62a08882aea88c80c
Minior edits from a quick glance through

Change-Id: I669b491285692a1716e3b35b1ef58477353163be
Tweak AFSCombineTokens

Reference the CombineTokens clarifications in this doc as
well as the core doc, and wordsmith.

Change-Id: I1f8a45cbeb8ca68d316795664eae1d3bb7125776
Remove redundant parenthetical

This is covered earlier.

Change-Id: I6f3025cfe3ca37020a7b7e0012d5f56eb91ae02d
Printed tokens need a container, too

Otherwise they will not function.

Change-Id: I368bdd3f3ca440ae7458579360f00cb5531a004f
Use subsubsections to avoid the wall of text nature

Move discussion of forbidding non-rxgk registration up above
the subsubsections since it is generic.

Change-Id: I9e9872abe6878dccecda575cc8858e48c85cf687
Remove double-thus and split paragraph

Change-Id: Ic2b067dd1857aa14ad18f3b4fa942af585f1010d
Add a note about manual keying

Don't care about the automated keying bits if manual keying
is used.

Change-Id: I025c8afe96f90959302d549455f4c09e3bc5f5cf
Improve transition

Change-Id: I1cfbff3918bcf3605fbcd52dcec34db7d4951fe1
Move around the 2119 MUST

It applies globally; rxgk is just a special case.

Change-Id: I1fdd094850a295762c47cf3a3debec4ca349effe
Reword this hunk a bit

Change-Id: I3b5522f6c43ca3a584c35fc9c56432baad1d4925
Roll changelog

Change-Id: Ib2e51083843fdbdefda89a576234bf9be6e77463
Make draft-wilkinson-afs3-rxgk-afs-05

Change-Id: Ia57a93f07edf9cd8a0cba1b6890f7449150023fe