Several sriov drivers (i.e. TaaS, Trunking) require the write permissions
to files in /sys/class/net/ and /sys/devices.
This patchset mounts the host's above mentioned sys-fs folders for the
neutron-sriov-agent container.
Change-Id: I87f51d1ad46bb272beb9401f2b428c81c3dc6f69