Some refer to issues that are closed. Remove them.
Some are runc bugs that will never be fixed. Say so, and remove
the FIXME.
One (bps/iops) should probably be fixed. File an issue for it, and
update comment to include the issue# so my find-obsolete-skips script
can track it.
And one (rootless mount with a "kernel bug?" comment) is still
not fixed. Leave the skip, but add a comment documenting the symptom.
Signed-off-by: Ed Santiago <santiago@redhat.com>