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* byvdc requires a Vpc interface implementation, which can be:
** compute plugin also implements Vpc. eg: PCR vcloudvcloud
** compute plugin + networking device. eg: vcenter + nsx device 
* changing the behavior of the pool when using a provider also capable of device ops (public clouds with lb,fw, net or nat features), previously using 2 pools (opensessions + device.opensessions), now a plugin capable of executin device ops only use the opensessions pool.
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