logical_volume: Add option to use dm device-path for mountpoint

[mmusenbr]

logical_volume: Add option use_dm_devicepath to use /dev/mapper/$vg-$lv instead of /dev/$vg/$lv

Summary

We have the requirement to use /dev/mapper entries in /etc/fstab, currently when using the lvm::logical_volume entries will always be /dev/$vg/$lv. To allow creation of entries with the /dev/mapper entries, an additional option use_dm_devicepath is introduced. The default value is set to keep the previous/default behavior.

From previous PRs (!124, !153, !199) it seems other have (or had) the requirement too, but it the PRs where never finalized from the PR openers.

Related Issues

• https://github.com/puppetlabs/puppetlabs-lvm/pull/124
• https://github.com/puppetlabs/puppetlabs-lvm/pull/153
• https://github.com/puppetlabs/puppetlabs-lvm/pull/199

Checklist

• [ ] 🟢 Spec tests.
• [ ] 🟢 Acceptance tests.
• [x] Manually verified. (For example puppet apply)

[CLAassistant]

All committers have signed the CLA.