astakos: Correctly set user password in user-add

password field contains the user password in hashed format. The proper way
to populate the field is by using the set_password method of the user object.

snf-astakos-app/astakos/im/management/commands/user-add.py

@@ -87,8 +87,8 @@ class Command(BaseCommand):
             u = AstakosUser(email=email,
                             first_name=first_name,
                             last_name=last_name,
-                            password=password,
                             is_superuser=options['is_superuser'])
+            u.set_password(password)
             u.save()
 
         except BaseException, e: