OPOperationConditionUserNotification does not wait for user to grant permissions

[pronebird]

Similar to OPRemoteNotificationCondition, OPOperationConditionUserNotification should wait for didRegisterUserNotificationSettings from application delegate.

Currently OPOperationConditionUserNotification sets alertPresentationExclusivity and calls registerUserNotificationSettings but it does not wait for acknowledgment from operating system.

This makes condition fail during first time run when permission alert shows up.

[pronebird]

I have a fix for that but I mainly work in OS X branch which is not yet merged.