Revert "Remove unused import"

This reverts commit 046e54bc46f02c1aff72506eb0e470f55b67a180.
Have pylint ignore the import
Skip lint on raet stuff still
avoid shadowing in dig module
Merge pull request #10557 from s0undt3ch/hotfix/lint

Revert "Remove unused import"
Merge pull request #10560 from hulu/dig-shadowing

avoid shadowing in dig module
Deprecate `salt.cloud-libcloudfuncs.libcloud_version` unil Salt Helium.

Instead use `salt.cloud-libcloudfuncs.check_libcloud_version`.
`LIBCLOUD_MINIMAL_VERSION` is now defined as a tuple.

Because tuples are comparable.
Update to the tuple based libcloud version requirement.

Double to single quotes and other minor formatting changes.
Libcloud requirement check is now done on the cloud parser class.
The `salt-cloud` script fails with missing or non sufficient libcloud version