krb5 security and bug fix update

1.6.1-78.el5 - gssapi: pull in upstream fix for a possible NULL dereference in spnego CVE-2014-4344, 1121509 1.6.1-77.el5 - fix what appears to be a cosmetic error in the patch for self-tests for CVE-2014-4341 1.6.1-76.el5 - run the backported self-tests, such as they are, for CVE-2014-4341...