Framework changes for resetting data usage statistics

As part of data management experience enhancements in Settings
application, a new feature is added. This feature allows users
to fully reset all data usage stats of currently selected network
interface.

When data stats are reset for a specific network interface, the
total data usage and per app data usage for that interface is
reset to zero. There is no way to revert this reset.

Prior to this feature, users could only change the data stats cycle
to hide older data usage history. Alternatively, users could perform
fully factory reset to remove the usage history. This feature allows
fully clearing data usage stats history without any other changes.

Change-Id: I242331cf85cec00997a8aa34e8bdcbccf0917864