Fix status codes in node controller

New WSME 0.5b6 allows to specify custom error code
for ClientSideError instead of default 400.
TODO removed from patch method because WSME 0.5b6
do correct handling Client/Server side errors for
user specific exceptions with 'code' attribute.
(WSME change I2663db0aa88538b722eb2783d130585b0fc2335b)

Change-Id: I5e44f7cc9490331d9f35f209ffe76cb0be6f4a20
Merge "Fix status codes in node controller"