Hyper-V: Fixes security groups issue

Hyper-V: Fixes security groups issue

After this patch If19be8579ca734a899cdd673c919eee8165aaa0e refactored
securitygroups_rpc, prepare_devices_filter attempts to use methods
unimplemented by the HyperV security groups driver.

For this reason, binding ports fails with NotImplementedError if
security groups are enabled.

Until the HyperV security groups driver reaches parity, the
use_enhanced_rpc property should be set to False on the
HyperVSecurityAgent, falling back to the old behaviour.

Change-Id: I1a7ee2b92367d2d59932b8b39372a055bf19951b
Closes-Bug: #1415523