Revert "IMPALA-970 The kinit renewal command should specify the credential cache file."

This reverts commit c410059adfd28563a8acb9426e12d7de926bd1df.

Change-Id: I13173194f55f2e8a3e182a0368f9584ae759111e
Reviewed-on: http://gerrit.ent.cloudera.com:8080/2451
Reviewed-by: Henry Robinson <henry@cloudera.com>
Tested-by: Henry Robinson <henry@cloudera.com>