[krbdev.mit.edu #5566] Web page recommends send-pr, but it kind of sucks

[Greg Hudson via RT]

Here are some krb5-send-pr references which should get tidied up with 
this change:

* The top-level README file (probably what the original bug report is 
referencing, since this gets copied to the release web pages).

* The man page installed from util/send-pr.  Probably we should just 
remove this.

* src/plugins/kdb/db2/libdb2/README