lxd/network/network/utils/test: Fix tests in Example_parseIPRange to work with Go tip
lxd/network/network/utils/test: Fix tests in Example_parseIPRange to work with Go tip

Works around change in Go https://github.com/golang/go/commit/d3e3d03666bbd8784007bbb78a75864aac786967

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

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