Add aodh composite alarm

Registered by huangtianhua

The combination type alarm has been deprecated[1],
because some issues which are hard to solved, and aodh team recommends to use composite rule alarm, see the spec[2].
The composite alarm is similar with the combination alarm in functionality but not a compatible implementation.
[1] https://review.openstack.org/#/c/318052/
[2] https://review.openstack.org/#/c/208786/4/specs/mitaka/composite-threshold-rule-alarm.rst

This blueprint will add the composite alarm resource plugin in heat.

Blueprint information

Status:
Complete
Approver:
None
Priority:
Medium
Drafter:
huangtianhua
Direction:
Needs approval
Assignee:
huangtianhua
Definition:
Approved
Series goal:
Accepted for ocata
Implementation:
Implemented
Milestone target:
milestone icon ocata-2
Started by
huangtianhua
Completed by
huangtianhua

Related branches

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Gerrit topic: https://review.openstack.org/#q,topic:bp/add-aodh-composite-alarm,n,z

Addressed by: https://review.openstack.org/352202
    Support OS::Aodh::CompositeAlarm resource

Addressed by: https://review.openstack.org/352354
    Support composite alarm

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