pull up r22090 from trunk

pull up r22090 from trunk

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 r22090 | ghudson | 2009-03-15 00:21:12 -0400 (Sun, 15 Mar 2009) | 10 lines
 Changed paths:
    M /trunk/src/plugins/kdb/ldap/libkdb_ldap/kerberos.ldif
    M /trunk/src/plugins/kdb/ldap/libkdb_ldap/kerberos.schema
    M /trunk/src/plugins/kdb/ldap/libkdb_ldap/ldap_principal.c
    M /trunk/src/plugins/kdb/ldap/libkdb_ldap/ldap_principal2.c

 ticket: 6420
 subject: Add LDAP back end support for canonical name attribute
 tags: pullup
 target_version: 1.7

 Add a krbCanonicalName attribute to the schema.  When looking up a
 principal, if the canonical name is set and does not match the
 requested name, then return the entry only if canonicalization was
 requested, and use the entry's canonical name.

ticket: 6420
version_fixed: 1.7

git-svn-id: svn://anonsvn.mit.edu/krb5/branches/krb5-1-7@22225 dc483132-0cff-0310-8789-dd5450dbe970