Remove the resolve_hostname function since
the resolve_hostname in cinder.utils does the exact same thing
so we can reuse it.
Change-Id: I3fcdaf8c9d91845bada9d2bff8967b04ab700992
Signed-off-by: Chuck Short <chucks@redhat.com>
Signed-off-by: zhu.boxiang <zhu.boxiang@99cloud.net>