Adds more testcases to test_telemetry_alarming_api

This submission is to add more testcases in "test_telemetry_alarming_api.py"
test_script. The test cases added are for scenarios "update-alarm",
"set-get-alarm-state", "create_delete_combination_alarm".
Removes alarm create logic from list_alarms method and uses the alarms
in setUp for verification.

Supporting functions "update_alaram", "alarm_get_state", "alarm_get_state"
are added and "put" method is modified in telemetry_client_base.py script.

Change-Id: Ie15cc48ee404db62fb9d74392ed2acc826b852d7
Implements: bp add-basic-ceilometer-tests
Merge "Adds more testcases to test_telemetry_alarming_api"