python/samba: samba4.blackbox.dbcheck.release-4-1-0rc3

python/samba: samba4.blackbox.dbcheck.release-4-1-0rc3

* Various string related fixed py2/py3
* Fix strange double decode followed by encode code (see comments
  in change)
* Added dump_attr_values, simply printing attribute values (from
  sequence) doesn't work (when using string '%s' format codes in
  existing string). We need to print out string from bytes in PY3
  and fallback to repr(which will print b'blah') if we get a decode error

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