This commit introduces the following Helm options:
- "loadBalancer.standalone" to enable the standalone Cilium L4LB.
- "loadBalancer.dsrDispatch" to choose the DSR dispatch mode.

Also, this commit replaces --node-port-{mode,acceleration} with
--bpf-lb-{mode,acceleration}, respectively. The former two were
deprecated by d73c572.

Signed-off-by: Martynas Pumputis <m@lambda.lt>

This commit introduces a new GH action called "Cilium L4LB XDP" which is
responsible for running the standalone LB tests.

The action starts a Fedora VM with vagrant. We do that because we need
to run Kind on cgroupv2-only machine (otherwise, bpf_sock which is
required by the LB health check is not guaranteed to work).
Unfortunately, GH Action does not support any runner with cgroupv2-only.
So instead we run Fedora 34 which has cgroupv1 disabled on the MacOS
runner which supports nested virtualisation.

For now the test issues 10 requests to LB VIP from the Fedora VM. See
test.sh for more details.

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Martynas Pumputis <m@lambda.lt>