Added readme
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Overview
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--------
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This principle charm provides the Neutron API service which was previously
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provided by the nova-cloud-controller charm. When this charm is joined with
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the nova-cc charm the nova-cc charm will shutdown its api service, deregister
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it from neutron and inform the compute nodes of the new neutron url. This
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charm expects the following relations:
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1) neutron-plugin-api relation with subordinate neutron plugin charms
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(such as neutron-openvswitch)
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2) neutron-api relation with nova-cloud-controller
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3) Database backend
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4) amqp relation with message broker. If a single message broker is being used for
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the openstack deployemnt then it can relat to that. If a seperate neutron
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message broker is being used it should relate to that.
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5) identity-service relation
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6) ha relation with ha subordinate
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