Test the response body when deleting a alarm

This change test the response body when deleting a alarm.

Because since wsme>=0.5b5 , the return code and the response
are the those expected by ceilometer.

Fixes bug #1209093

Change-Id: I6699665be5938a9c699b179d241725b242bbea4a
Merge "Test the response body when deleting a alarm"