merge notification service and legal service updates from opendes
From Opendes: Merged PR 1663: extract subscription(containing model) to os-core-common
- joint os-notification's subscription factory lib with core-common's util
- create a Notification module in os-core-common .
- change default root URL point to opendes env
Merged PR 1682: Set default expirationDate if empty provided
Set default expirationDate if empty provided. When legalTag is created expiration date may be passed or not, need to handle a case, when it is "".
Edited by Chad Leong