Pull server principal and remote address out of get_token

They're still hardcoded parameters, but will be easier to change
in the future.

Change-Id: I49e7aec78de13d7ba426e48db52018e69574a3a2
Wordsmith get_token_round_trip comment

Change-Id: I6a648537c33afd2ab799a610c43fce48d89ac2ac
Include rxgk.h in security-class files

We'll need these prototypes eventually.

Note that gssapi.h is currently a prerequisite of rxgk.h, which should
be removed eventually.

Change-Id: Ic2fd4b33272f0aded0746f5fed468a4ee2453909
rxgk_NewServerSecurityClass

Not usable, as no functions implement the rxgk_getkey_func type yet.

Change-Id: Iab544886cb8a3531edd5cf0841b1d351fa2ce050
dummy_getkey to implement rxgk_getkey_func

We already did most of the work in rxgk_crypto.

Change-Id: I660f5cfcbf7271309f74ebf16b2e8d406b01dd04
Register an RXGK security object for rxgkd

Use the dummy getkeyfunction and the NewServerSecurityObject function
to populate rxgk's slot in the array of security objects.

Change-Id: I07b905908401081e98192f46a00c4b3d6f622d0a
Add rxgk_NewClientSecurityObject

Store the key, token, etc. in the class-private data.

Change-Id: I52f029483212bd9614d08696f730628ebbdb2277
Security index must be parameter to get_token

Since we're passing in a security object, we need to know which
index to use...

Change-Id: Ic173091ba9bb99e865c4d0d4acb127fa06505189
Return more things from get_token

Like, say, the token itself, as well as some tokeninfo and the
token master key.

Change-Id: I53bb5b7c2949562c09036ec8b2945d426ced4ce3
We need an rxgk_key back from get_token

Not just an RXGK_Data.

Change-Id: Icab3f8114730cc28f03c3831279052a3f210991a
Client security object doesn't need a kvno

Only the server needs to care, I think.

Probably means we don't need to track enctype, either, as that is
tracked within the rxgk_key, but leave it for now.

Change-Id: I1102da7cb93f68115a7ddd3c38e3d58c9e5cf720
fixup gss loop refactor

Be sure to initialize things if we're always freeing them.

Change-Id: I9de6c40c064b6c59ef9d83fe5d34ff174d43b4bc
Get a token over an rxgk connection

We call through our dummy methods that always return success.
Now we can start making them not-dummy!

Change-Id: Icd6f9d64f737b02e858bcae7fcc6c008e6ddf377