Don't create _member_ role from puppet

The _member_ role is provided by db migration or is created
automatically when user is created. Creating role _member_ from
puppet causes it to have different id than the one specified in
member_role_id keystone config option.

Change-Id: I3f0102b184a484f5e5a85cadf26ed651829fbf8c
Closes-Bug: rhbz#1129760