Document lack of support for Pod traffic shaping on Photon OS 3

[antoninbas]

Egress traffic shaping is not supported because of a missing Kernel
module (ifb), which is required by the bandwitdh CNI plugin.

This change also updates TestPodTrafficShaping to skip the test if some
of the required Kernel modules for traffic shaping are missing.

Fixes #1516

[antrea-bot]

Thanks for your PR.
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[codecov-io]

Codecov Report

Merging #1548 (24e0537) into master (9d3d10b) will decrease coverage by 1.46%.
The diff coverage is 53.79%.

@@            Coverage Diff             @@
##           master    #1548      +/-   ##
==========================================
- Coverage   63.31%   61.85%   -1.47%     
==========================================
  Files         170      181      +11     
  Lines       14250    15159     +909     
==========================================
+ Hits         9023     9377     +354     
- Misses       4292     4780     +488     
- Partials      935     1002      +67     

Flag	Coverage Δ
kind-e2e-tests	52.33% <50.94%> (-3.06%)	⬇️
unit-tests	40.66% <12.56%> (-0.62%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
cmd/antrea-agent/agent.go	0.00% <0.00%> (ø)
.../agent/flowexporter/connections/conntrack_linux.go	28.37% <0.00%> (-0.79%)	⬇️
pkg/agent/stats/collector.go	97.72% <ø> (ø)
pkg/ovs/openflow/ofctrl_builder.go	60.58% <0.00%> (-1.59%)	⬇️
pkg/ovs/openflow/ofctrl_group.go	48.57% <0.00%> (-4.56%)	⬇️
pkg/ovs/openflow/ofctrl_action.go	53.36% <5.71%> (-8.00%)	⬇️
pkg/agent/agent.go	48.84% <33.33%> (+0.13%)	⬆️
pkg/agent/proxy/types/types.go	60.00% <33.33%> (-24.62%)	⬇️
pkg/controller/networkpolicy/validate.go	46.08% <33.33%> (+1.25%)	⬆️
pkg/agent/controller/networkpolicy/reconciler.go	71.32% <50.00%> (ø)
... and 34 more

[tnqn]

LGTM

[antoninbas]

/test-e2e

[antoninbas]

/test-conformance
/test-networkpolicy