* Implements blueprint multiple-floating-ip-ranges
* Adds pool and interface fields to floating ip tables
* Adds extension to get a list of available pools
* Optionally allows a pool to be specified when allocating
* Changes nova-manage command to allow pool and interface
* Ip binding uses the interface from table instead of flag
* Adds default pool flag to use when pool is not specified
* updates test to work with new fields
* adds tests for extension
Change-Id: Ieb4cbbf07b211697d08178b1cf2252caf75049a2
ce6e2050b9