IBM / ubiquity / 1388

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Fix/ub 1060 unmount should continue on faulty device (#246)

This PR is solving the following idempotent issue:
in case the umount process fails after the volume is already detached in the storage but the multipath device still exists, the next umount we will try to run will fail and get stuck on the "umount" command forever.
the solution is to run the dmsetup command before the umount command (dmsetup puts 0 to queue_if_no_path). this seems to solve the issue for this scenario and we are able to finish the umount without further issues.
(also this was checked for staging and the regular flow works fine as well)

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