Add a status field to the return value for get_deal_activation

[rllola]

When calling get_deal_activation for an expired deal it will throw an error instead of returning the proper status. It is an issue when dealing with solidity because of its error handling limitation.

In order to have a standard behavior, adding a status field on the returned answer for this call would help knowing the state of the deal.

Anything that would indicate the state of the deal would help.