Allow override QPS and Burst via flag

[pierDipi]

Fixes #1700

Add --kube-api-qps and --kube-api-burst command-line flags
to control client QPS and Burst respectively.

The default value is set to 0 to keep backward compatibility.

[pierDipi]

/cc dprotaso mattmoor

[codecov]

Codecov Report

Merging #1778 into master will decrease coverage by 0.11%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #1778      +/-   ##
==========================================
- Coverage   68.25%   68.13%   -0.12%     
==========================================
  Files         218      218              
  Lines        9295     9305      +10     
==========================================
- Hits         6344     6340       -4     
- Misses       2636     2648      +12     
- Partials      315      317       +2     

Impacted Files	Coverage Δ
injection/config.go	0.00% <0.00%> (ø)
test/gcs/mock/mock.go	90.32% <0.00%> (-2.16%)	⬇️

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[pierDipi]

Ref: #1672

resource_view_test.go:371: failed to fetch prometheus metrics: Get "http://localhost:19090/metrics": dial tcp 127.0.0.1:19090: connect: connection refused
    --- FAIL: TestMetricsExport/Prometheus (0.05s)

resource_view_test.go:441: Unexpected OpenCensus exports (-want +got):
          []metrics.metricExtract(Inverse(Sort, []string{
        - 	"knative.dev/serving/testComponent/global_export_counts<>:2",
        - 	"knative.dev/serving/testComponent/resource_global_export_count<>:2",
        - 	`knative.dev/serving/testComponent/testing/value<project="p1",revision="r1">:0`,
        - 	`knative.dev/serving/testComponent/testing/value<project="p1",revision="r2">:1`,
          }))
    --- FAIL: TestMetricsExport/OpenCensus (4.33s)

/retest

[vagababov]

/lgtm

[n3wscott]

This will be lost when #1772 lands.

[n3wscott]

Flakes: #1779

[pierDipi]

Ref: #1672

=== CONT  TestMetricsExport/OpenCensus
    resource_view_test.go:435: Timeout reading input
    resource_view_test.go:441: Unexpected OpenCensus exports (-want +got):
          []metrics.metricExtract(Inverse(Sort, []string{
        - 	"knative.dev/serving/testComponent/global_export_counts<>:2",
        - 	"knative.dev/serving/testComponent/resource_global_export_count<>:2",
          	`knative.dev/serving/testComponent/testing/value<project="p1",rev`...,
          	`knative.dev/serving/testComponent/testing/value<project="p1",rev`...,
          }))
    --- FAIL: TestMetricsExport/OpenCensus (4.30s)

/retest

[n3wscott]

/lgtm
/approve
/retest

[knative-prow-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: n3wscott, pierDipi

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