python/samba: Ensure md5 always provided with bytes

To allow code run in both python3 and python2 we have to ensure
that md5 always receives bytes

Signed-off-by: Noel Power <noel.power@suse.com>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>

python/samba/tests/password_hash.py

@@ -35,6 +35,7 @@ import samba
 import binascii
 from hashlib import md5
 import crypt
+from samba.compat import text_type
 
 
 USER_NAME = "PasswordHashTestUser"
@@ -61,6 +62,9 @@ def get_package(sc, name):
 def calc_digest(user, realm, password):
 
     data = "%s:%s:%s" % (user, realm, password)
+    if isinstance(data, text_type):
+        data = data.encode('utf8')
+
     return md5(data).hexdigest()