hotplug: Use QMP in VerifyHotplugSupport
hotplug: Use QMP in VerifyHotplugSupport

This used to check whether a specific hotplug action is supported.
Since everything is about to be done via qmp commands delegate these
checks to QmpConnection class.

Signed-off-by: Dimitris Aragiorgis <4514117c4a99256e19437c7e3407c4ecbf98aec0@grnet.gr>
Reviewed-by: Hrvoje Ribicic <be5828fca31f89218048bec4189e30a581aa65da@google.com>

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