pythonPackages.psutil: disable tests due to test failures

Tests are very flaky and depend on the exact execution environment. It
is weird that it has gone well so far but started causing issues across
many of my builders.

Also started rewording some of the comments in the expression so
hopefully the next person looking at this has an easier time to
understand it.

On systems where swap is available and fully used tests fail like this:

>    def test_swap_memory(self):
>         mem = psutil.swap_memory()
>         self.assertEqual(
>             mem._fields, ('total', 'used', 'free', 'percent', 'sin', 'sout'))
>
>         assert mem.total >= 0, mem
>         assert mem.used >= 0, mem
>         if mem.total > 0:
>             # likely a system with no swap partition
> >           assert mem.free > 0, mem
> E           AssertionError: sswap(total=1048567808, used=1048567808, free=0, percent=100.0, sin=50741248, sout=1316823040)
> E           assert 0 > 0
> E            +  where 0 = sswap(total=1048567808, used=1048567808, free=0, percent=100.0, sin=50741248, sout=1316823040).free

Upstream bug report: https://github.com/giampaolo/psutil/issues/1911

Systems where /proc/mounts doesn't expose any mount points to build the
tests fail like this:

>     def test_disk_partitions(self):
>             self.assertIsInstance(nt.device, str)
>         def check_ntuple(nt):
>             self.assertIsInstance(nt.mountpoint, str)
>             self.assertIsInstance(nt.fstype, str)
>             self.assertIsInstance(nt.opts, str)
>             self.assertIsInstance(nt.maxfile, (int, type(None)))
>             self.assertIsInstance(nt.maxpath, (int, type(None)))
>                 self.assertGreater(nt.maxfile, 0)
>             if nt.maxfile is not None and not GITHUB_ACTIONS:
>             if nt.maxpath is not None:
>                 self.assertGreater(nt.maxpath, 0)
>
>         # all = False
>         ls = psutil.disk_partitions(all=False)
> >       self.assertTrue(ls, msg=ls)
> E       AssertionError: [] is not true : []

Upstream bug report: https://github.com/giampaolo/psutil/issues/1912

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