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Now that Open vSwitch has support for multiple simultaneous controllers, there is some need for a degree of coordination among them. For now, the plan is for the controllers themselves to take the lead on this. This commit adds a small bit of OVS infrastructure: the ability for a controller to designate itself as a "master" or a "slave". There may be at most one master at a time; when a controller designates itself as the master, then any existing master is demoted to slave status. Slave controllers are not allowed to modify the flow table or global configuration; any attempt to do so is rejected with a "bad request" error. Feature #2495.