6854308 adds an argument to "ktab -d" so that "ktab -d name etype" means removing all keys for "name" with encryption type "etype".

This is not consistent with the popular kadmin command ktremove, where the extra argument is used to denote version number:

   ktremove [-k keytab] [-q] principal [kvno | all | old]

A better design may look like

   ktab -d name -e etype [kvno | all | old]