lxd/storage/drivers/utils: Removes implication of project awareness from driver mount point helpers
lxd/storage/drivers/utils: Removes implication of project awareness from driver mount point helpers

Drivers are not project aware, and instead rely on the volume name to be prefixed with project before being passed into driver.

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

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