this works around a limit on file descriptors which we encounter in kind
in CI. newer kind images impose a limit of 1024 file descriptors which
isn't trivial to change; haproxy seems to try to request just over 2*n
file descriptors where n is the max number of connections; as such, if
we limit max-connections to 250 we should be comfortably within the
limit
Signed-off-by: Ashley Davis <ashley.davis@jetstack.io>
