python/samba: Add binary_type for p2/p3 testing.

For helping test for binary types, binary_type evaluates to 'str'
in py2, and 'bytes' in py3.

Signed-off-by: Noel Power <noel.power@suse.com>
Reviewed-by: Alexander Bokovoy <ab@samba.org>

python/samba/compat.py

@@ -30,6 +30,7 @@ if PY3:
     integer_types = int,
     string_types = str
     text_type = str
+    binary_type = bytes
 
     # alias
     import io
@@ -43,6 +44,7 @@ else:
     integer_types = (int, long)
     string_types = basestring
     text_type = unicode
+    binary_type = str
 
     # alias
     import StringIO