Security update for krb5 (important)

krb5 was updated to fix three security issues.

These security issues were fixed:

• CVE-2015-2695: Applications which call gss_inquire_context() on a
  partially-established SPNEGO context could have caused the GSS-API
  library to read from a pointer using the wrong type, generally causing a
  process crash. (bsc#952188).
• CVE-2015-2696: Applications which call gss_inquire_context() on a
  partially-established IAKERB context could have caused the GSS-API
  library to read from a pointer using the wrong type, generally causing a
  process crash. (bsc#952189).
• CVE-2015-2697: Incorrect string handling in build_principal_va can lead
  to DOS (bsc#952190).