Allow to use existing router or create new router

Registered by PanFengyun

When Magnum creates a cluster, the cluster need a router from neutron.
Currently Magnum just create a router by heat template.
Allowing user to specify a existing router for Magnum cluster will be better.
TODO:
   1.specify existing router into baymodel
   2.update the temlate of driver

Blueprint information

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

Related branches

Sprints

Whiteboard

Gerrit topic: https://review.openstack.org/#q,topic:bp/specify-existing-router,n,z

Addressed by: https://review.openstack.org/409514
    Specify existing router to create cluster

Addressed by: https://review.openstack.org/409667
    Validate router when user specify a existing router

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Work Items

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