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This patch changes the behaviour of the Impala shell to refuse to attempt an LDAP-authenticated connection to Impala unless SSL/TLS is configured. A new flag --auth_creds_in_clear_ok is added to suppress this behaviour. This is similar to Impala's --ldap_passwords_in_clear_ok flag. The shell will also now print a warning if an insecure configuration is used. Change-Id: Ide25d8dd881a61b9f08900112466c430da64a038 Reviewed-on: http://gerrit.cloudera.org:8080/546 Reviewed-by: Casey Ching <casey@cloudera.com> Tested-by: Internal Jenkins