[#380] Status property in message response changed to type String.
[#380] Status property in message response changed to type String.

The description of the Device Registration and Credentials API defined
the status in the response message as type "int", but the implementation
uses the type "String". This is fixed in the documentation now.

Signed-off-by: Karsten Frank <22534dcdeefa21bf02bac7694b065eeae56646bb@bosch-si.com>

dejanb/hono,dejanb/hono,dejanb/hono