allowed-adress-pair-ext: Fix response code

The documentation states that Normal Response Code is 200 OK. The Normal
Response Code is in fact 201.

Change-Id: Ied3e73d1c1bd8b13385601db52db54a07ea4f9b3
Closes-bug: #1270945
Signed-off-by: Emilien Macchi <emilien.macchi@enovance.com>
Merge "allowed-adress-pair-ext: Fix response code"