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OFAgent: Simplify bridge setup

https://blueprints.launchpad.net/neutron/+spec/ofagent-bridge-setup

Problem Description

ofagent uses bridge name (eg. "br-int") to specify the bridge to control. it's OVS-dependent.
ofagent automatically set up the bridge on startup. (i.e. add-br, set br protocols, set-controller, etc) there are little point to perform it every time an agent starts up. one-time setup during deployment is enough. also, it's OVS-dependent.

Proposed Change

use datapath-id instead of bridge name. introduce a new config option to specify the bridge using datapath-id. make it an alternative of "integration_bridge" option.
remove code to set up the bridge from ofagent. document the instruction to set up the bridge instead.
adapt devstack accordingly.
retire "integration_bridge" option for ofagent later. (probably in "L" cycle.)

Alternatives

instead of datapath-id, OFPMP_DESC might be usable to distinguish bridge. OVS by default doesn't provide useful description though.

Data Model Impact

none

REST API Impact

none

Security Impact

none

Notifications Impact

none

Other End User Impact

none

Performance Impact

none

IPv6 Impact

none

Other Deployer Impact

a deployer needs to update his config.

Developer Impact

none

Community Impact

none

Implementation

Assignee(s)

Primary assignee:: yamamoto
Other contributors:: kakuma

Work Items

see "Proposed Change" section.

Dependencies

none

Testing

update the existing tests if necessary.

Tempest Tests

none

Functional Tests

none

API Tests

none

Documentation Impact

User Documentation

the new option and upgrade instruction need to be documented.

Developer Documentation

none

References

none