Allow tools to handle qualitygate new response format

Task to handle qualitygate#11 (closed)

Qualitygate response is now a dictionary instead of string, and we must implement the subsequent response handling for opentf-tools. This dictionary contains qualitygate rule name, rule application result (SUCCESS/FAILURE/NOTEST) and test executions statistics. These informations must be displayed, in a user-friendly way, as a result of the opentf-ctl get qualitygate command.