Add event delete support

Registered by chenyb4

The senlin has support:

event-list List events
event-show Describe the event.

This feature will be add event-delete, use senlin event-delete `Id` or `Name` delete has exist event.

This feature will be operation , Add event-delete api, the new api

    DELETE /v1/events/{event_id}

Blueprint information

Status:
Not started
Approver:
None
Priority:
Undefined
Drafter:
chenyb4
Direction:
Needs approval
Assignee:
chenyb4
Definition:
Discussion
Series goal:
None
Implementation:
Unknown
Milestone target:
None

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This item doesnt have a clear use case ...

Gerrit topic: https://review.openstack.org/#q,topic:bp/add-event-delete,n,z

Addressed by: https://review.openstack.org/465576
    Add db support event-delete operation

(?)

Work Items

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