Replace majority of functions from blivet/devicelibs/ with calls to the *libblockdev*
library. Also remove tests for such replaced functions and Requires: for tools we no
longer directly need and replace calls to pyblock and volume_key-python with calls to
libblockdev so that we can drop these dependencies.
``tests/pylint/runpylint.sh`` and ``make test`` are both okay with these changes.
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To view this pull request on github, visit
https://github.com/rhinstaller/blivet/pull/28