Fix abbreviated title
Initial commit of krb5 extra round trip I-D

TODO:

 - add more motivation text
 - list all the errors for which this is useful
   (wrong kvno, no key, key mismatch(?), clock skew, any others?)
 - describe the use of this for replay cache avoidance
 - describe the use for sname redirect (for clustering and more rcache
   avoidance)