Fix bug in addprinc: was passing password via kadmin.local -w option instead of via addprinc -pw option. The former is for authenicating access to kadmin.local (not necessary for root/admin@REALM), whereas the later is for setting the password of the new principal, which is what we meant.  Also, make addprinc require that the krb5-kdc service be running, as this is necessary for this command.
Merge pull request #3 from greg-1-anderson/addprinc-pw

Fix bug in addprinc: use -pw option