title: kadmin does not use kinit for authentication?
body: <p>First, I run <code>kinit {principal} -k -t {keytabfile}</code> with keytab file.</p>
  
  <p>Second, I run <code>klist</code> to check whether there exists TGT.</p>
  
  <p>All seems work fine, but when I run <code>kadmin -p {principal}</code>, keytab or password still needed.</p>
  
  <p>Does that means kadmin does not use kinit for authentication?</p>