* decrypt_key.c (krb5_dbekd_decrypt_key_data()) : If key salt length

	* decrypt_key.c (krb5_dbekd_decrypt_key_data()) : If key salt length
		is 0 then set keysalt->data.data to NULL.
	* kdb_cpw.c (add_key_rnd(), add_key_pwd()) : When creating new keys
		for a new kvno and there are multiple enctypes that use a
		common keytype, then set the enctype in the key to the first
		specified enctype and skip all other enctypes that use
		the same keytype. (This assumes the salt type is the same too.)
		This way when the kdc needs to get the server key it doesn't
		need to gues what enctypes the server supports.
	* kdb_xdr.c (krb5_dbe_find_enctype()): Match keys that use common
		keytypes but different enctypes. Eg. ENCTYPE_DES_CBC_MD5
		matches ENCTYPE_DES_CBC_CRC and vice versa.
	* kdb_xdr.c krb5_dbe_find_enctype()): If kvno = 0 then determine
		maxkvno for all the keys and then search keys for a key that
		matches enctype salttype and has kvno == maxkvno. This
		is different than when kvno = -1 which searches the keys
		for THE key with the greatest kvno which also matches enctype
		and salttype.
	* kdb_kdr.c (krb5_dbe_find_enctype()): If kvno = ktype = stype = -1
		then set kvno = 0. The first doesn't make a lot of sense.
	* kdb_xdr.c (krb5_dbe_encode_last_pwd_change(),
		krb5_dbe_decode_last_pwd_change()) : Added.
	* kdb_xdr.c (krb5_decode_princ_contents()) : Don't try to allocate
		space for keys if n_key_data = 0.

git-svn-id: svn://anonsvn.mit.edu/krb5/trunk@7012 dc483132-0cff-0310-8789-dd5450dbe970