Fix config check in krb5_cccol_have_content

krb5_is_config_principal should be invoked on creds.server, not
creds.client.

https://github.com/krb5/krb5/commit/a2c55a8fe63e67dd8389fb30e8b8103e83124cec
Author: Greg Hudson <ghudson@mit.edu>
Commit: a2c55a8fe63e67dd8389fb30e8b8103e83124cec
Branch: master
 src/lib/krb5/ccache/cccursor.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)