tests: Test to make sure partition and disk names match libparted

[bcl]

In the past there have been problems with pyparted not including all of
the partition flags from libparted due to it's use of enums in the
_LAST macros. These were not caught by the tests because they skipped
flags that had no attribute (a valid case when building against an older
parted).

This adds tests that include all known parted flags, and uses libparted
to decide which ones must be included. The test will return errors for
all flags that libparted reports that are not attributes of _ped

If libparted reports a flag that pyparted does not support it is not
a failure and will be reported as a skipped test:

skipped 'Unknown flag: linux-home'

[bcl]

Cool, the new test is working. It's running against F36 where the new parted hasn't gone stable yet, so it is reporting that it is missing the known flags.

[dcantrell]

I like this change, but the unit tests have failed.

[dcantrell]

I like this change, but the unit tests have failed.