mountinfo: rewrite to use a test-table
mountinfo: rewrite to use a test-table

This allows us to more easily add more/other samples, as well as
combine the TestParseFedoraMountinfo,  TestParseUbuntuMountinfo,
TestParseGentooMountinfo, and TestParseFedoraMountinfoFields tests.

Signed-off-by: Sebastiaan van Stijn <64b2b6d12bfe4baae7dad3d018f8cbf6b0e7a044@gone.nl>

moby/sys