Revision 1914518

Fix inconsistency in path argment on Config.which_group()

Previously, we call Config.which_group() with path as bytes in
Commit.__init__() and with path as str in Lock.__init__() and
in PropChange.__init__(), but Config.which_group handled path
argment as bytes. To fix it we only use str as path argment on
Config.wich_group().

* tools/hook-scripts/mailer/mailer.py
  (Config.which_groups): Treat path as str.
  (Commit.__init__): convert bytes path into str before calling above.

Found by: Ruediger Pluem (rpluem {_AT_} apache.org)
Review by: dsahlberg