Fixes: #5993
Several tests utilize linux'isms like Mounts, bindmounts, vsock etc.
Let's ensure that these are still tested on Linux, but that we also skip
these tests when on other operating systems (Darwin). This commit just
moves tests; there shouldn't be any functional test changes. While the
tests still won't be runnable on Darwin/other hosts yet, this is a necessary
step forward.
Signed-off-by: Eric Ernst <eric_ernst@apple.com>
Signed-off-by: Danny Canter <danny@dcantah.dev>
