We want to continue to recursively deactivate the parents even if
the current device is inactive, but we don't want to run the
_postTeardown method of a device we're not deactivating.
On rhel7-branch, this will be preceded by a revert of a909ea38.
Related: rhbz#1182229
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To view this pull request on github, visit
https://github.com/rhinstaller/blivet/pull/212