remove route table when using cilium CNI

[khenidak]

What this PR does / why we need it:
fixes #2829 -- no route table + disable route controller when using cilium

WIP note: this PR is still under test.

[khenidak]

@jackfrancis @CecileRobertMichon ready for review..

[jackfrancis]

lgtm

[codecov]

Codecov Report

Merging #2834 into master will increase coverage by 0.2%.
The diff coverage is 60%.

@@            Coverage Diff            @@
##           master    #2834     +/-   ##
=========================================
+ Coverage   46.73%   46.93%   +0.2%     
=========================================
  Files          86       86             
  Lines       12862    12822     -40     
=========================================
+ Hits         6011     6018      +7     
+ Misses       6294     6249     -45     
+ Partials      557      555      -2

Impacted Files	Coverage Δ
pkg/api/types.go	27.27% <0%> (-1.62%)	⬇️
pkg/acsengine/defaults-controller-manager.go	100% <100%> (ø)	⬆️
pkg/acsengine/engine.go	62.91% <100%> (+0.05%)	⬆️
pkg/acsengine/defaults-cloud-controller-manager.go	100% <100%> (ø)	⬆️
pkg/api/vlabs/validate.go	42.93% <0%> (+0.14%)	⬆️
test/e2e/azure/cli.go	4.05% <0%> (+0.75%)	⬆️
pkg/operations/kubernetesupgrade/upgrader.go	57.5% <0%> (+0.83%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update f304349...ebebd78. Read the comment docs.