s4:kdc/db-glue: samba_kdc_trust_message2entry() should use the normalized principal...

s4:kdc/db-glue: samba_kdc_trust_message2entry() should use the normalized principal as salt

smbclient //w2012r2-183.w2012r2-l4.base/netlogon -c 'ls' -k yes -Uadministrator@S4XDOM.BASE%A1b2C3d4
worked while
smbclient //w2012r2-183.w2012r2-l4.base/netlogon -c 'ls' -k yes -Uadministrator@s4xdom.base
failed, if aes keys are used across the trust.

Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Guenther Deschner <gd@samba.org>
Autobuild-User(master): Günther Deschner <gd@samba.org>
Autobuild-Date(master): Fri Mar 27 04:02:05 CET 2015 on sn-devel-104