Adds more verification in list alarms

This submission is to add more verification logic in
test_list_alarms test method of "test_telemetry_alarming_api.py"
test script.

Change-Id: I70a8e40bfc8930c607254bf1da43ba38dc646a74
Implements: bp add-basic-ceilometer-tests
Merge "Adds more verification in list alarms"