This was only used in get_first_mon, which doesn't actually
need the parameter itself. Makes it easier to casually
use Filesystem from any place with a ctx to hand.
Signed-off-by: John Spray <john.spray@redhat.com>
Now that we have more of these cases, there was lots
of duplication in setup and teardown. For some tests
the "reset everything" setup/teardown is overkill,
but it's harmless.
Signed-off-by: John Spray <john.spray@redhat.com>