Support to use vegeta client with HTTPS

[nak3]

e2e test supports --https option but vegeta client always uses "HTTP".
This patch supports https wit so vegeta uses TLS client.

Release Note

NONE

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: nak3

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[nak3]

/test foo

[knative-prow]

@nak3: The specified target(s) for /test were not found.
The following commands are available to trigger required jobs:

• /test build-tests
• /test contour-latest
• /test contour-tls
• /test gateway-api-latest
• /test istio-latest-no-mesh
• /test istio-latest-no-mesh-tls
• /test kourier-stable
• /test kourier-stable-tls
• /test unit-tests
• /test upgrade-tests

The following commands are available to trigger optional jobs:

• /test https
• /test istio-latest-mesh
• /test istio-latest-mesh-short
• /test istio-latest-mesh-tls
• /test performance-tests-kperf
• /test performance-tests-mako

Use /test all to run the following jobs that were automatically triggered:

• build-tests_serving_main
• istio-latest-no-mesh-tls_serving_main
• istio-latest-no-mesh_serving_main
• unit-tests_serving_main
• upgrade-tests_serving_main

In response to this:

/test foo

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[nak3]

/test https

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +0.01% 🎉

Comparison is base (f9d9b28) 86.25% compared to head (ad447b4) 86.26%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #14255      +/-   ##
==========================================
+ Coverage   86.25%   86.26%   +0.01%     
==========================================
  Files         199      199              
  Lines       14811    14811              
==========================================
+ Hits        12775    12777       +2     
+ Misses       1734     1732       -2     
  Partials      302      302              

see 3 files with indirect coverage changes

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[nak3]

/retest

Infra issue All cluster resources were brought up, but: only 8 nodes out of 12 have registered; cluster may be unhealthy.

[krsna-m]

/lgtm