Fix alarm-combination-update operator argument

Fix the shell argument for alarm-combination-update for operator.

Change-Id: I4d04204213c8f17213adde2c02d8517b9565c0c3
Closes-Bug: bug #1260817
Display message on HTTP 400

This patch parses the faultstring given by the server on 400 errors if
available.

Change-Id: Ieae2f0b39fed2c45f276d6c931bebfebab9f696e
Closes-Bug: bug #1260394
Merge "Display message on HTTP 400"