[krbdev.mit.edu #5468] delete kadmin v1 support

[Ken Raeburn via RT]

We should get rid of the v1 kadmin support.

Certainly get rid of the support in admin.h if we make it public, to prevent anyone from using it 
in new programs.  Ideally, kill the support in the library and server as well, if we aren't 
supporting anything that needs it.

I think this would mean getting rid of the ancient password-changing service built into 
kadmind, for which we haven't installed a client program in a long time.  And we can finally kill 
the client^H^H^H^H^H^Htest program we use to make sure the server still works (see ticket 
1255), and a bunch of ugly code in the library that makes functions take different data 
structures depending on the caller's macro definitions, all the ovsec_* wrapper functions, etc.  
It'll also make creating an rpcgen input file for the kadmin protocol much easier.