KUDU-2385: Fix typo in KinitContext::DoRenewal()
KUDU-2385: Fix typo in KinitContext::DoRenewal()

On platforms without krb5_get_init_creds_opt_set_out_ccache(),
krb5_cc_store_cred() is called to insert the newly acquired
credential into the ccache. However, there was a typo in the code
which resulted in inserting the old credential into ccache.
This change fixes the typo to make sure the new credential is
inserted into ccache.

Testing done: confirmed on SLES11 that the new credential
is being inserted by checking the 'auth time' of the ticket
in ccache. Impala uses a slightly different #ifdef which
explicitly checks if krb5_get_init_creds_opt_set_out_ccache()
is defined on the platform so this code path is actually
used when running Impala on SLES11.

Change-Id: I3a22b8d41d15eb1982a3fd5b96575e28edaad31c
Reviewed-on: http://gerrit.cloudera.org:8080/9840
Reviewed-by: Todd Lipcon <2c763d726a8c2f6afda9be7e0e56a2caa6bb5e6b@apache.org>
Tested-by: Todd Lipcon <2c763d726a8c2f6afda9be7e0e56a2caa6bb5e6b@apache.org>

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