container/lxc: Moves stop time physical/sriov device detach into cleanupNetworkDevices
container/lxc: Moves stop time physical/sriov device detach into cleanupNetworkDevices

This paves the way for the device interface to move all other host-side setup/cleanup out of container_lxc.go.

Signed-off-by: Thomas Parrott <6b778ce645fb0e3dde76d79eccad490955b1ae74@canonical.com>

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