IP Address input value control - move validation and persistence out from onTextChanged into onEditingFinished but needs UI change (maybe adding a new "done" button)

[pablomartin4btc]

Now, every time a user types into the ip address input value, the value is validated and persisted (if #433 gets merged), this is because of the nature of the app design, there's no where to "accept" the changes or land after editing a value. Originally the validation was triggered in the editing finished but it seemed more correct to move it into the text change due to the above reason. But when we added the persistence logic (#433), didn't feel right anymore, so @GBKS suggested to add a "done" button when we revert back to the correct event again: