[EAGLE-971] fix a bug that duplicated queues are generated under a monitored stream

https://issues.apache.org/jira/browse/EAGLE-971

New policies for alert spec generation
1. each alert bolt has no more than 'coordinator.policiesPerBolt' policies.
2. each alert bolt has no more than 'coordinator.streamsPerBolt' queues if 'reuseBoltInStreams' is true
3. NO queues on one alert bolt have the same StreamGroup.

Author: Zhao, Qingwen <qingwzhao@apache.org>

Closes #895 from qingwen220/EAGLE-971.
4 files changed