Updated notification_settings fixture according to notification_datetime replacement with separate day, hour, minute fields.
Fixed problems with metric_controller test.
 * changed test tariff start date to 2 years ago to make it turned on for any test metric.
 * updated report path to month_year_path
Test should check that when we've  created new tariff or updated old one we should be redirected to all tariffs page.
Notification settings now automatically created and filled with default values after user created. All tests passed.