Currently we have an ip_cache returned from _find_floating_ip() which
is generally ignored as it is not always required.
This patch removes the need of ip_cache in _find_floating_ip().
Co-Authored-By: Sindhu Devale<sindhu.devale@intel.com>
Change-Id: I8b92271185f82f275fa73adad03e9dad70be70e4