Disable principal renames for LDAP

The current principal rename procedure does not work with the LDAP KDB
module, instead having the effect of deleting the principal.  The fix
is not easy and requires amending the DAL (see issue #8065).  For now,
detect LDAP and error out when a rename operation is attempted.

https://github.com/krb5/krb5/commit/8483243664a289fea142d8a9de61eba30d713871
Author: Greg Hudson <ghudson@mit.edu>
Commit: 8483243664a289fea142d8a9de61eba30d713871
Branch: master
 src/lib/kadm5/srv/svr_principal.c |   13 +++++++++++++
 1 files changed, 13 insertions(+), 0 deletions(-)