Fix custom tls setting for tlsmirror roundtripper enrollment

[xiaokangwang]

This pull request fix up the custom tls(security) setting for tlsmirror roundtripper enrollment. This allow the use of an public shared tls mirror enrollment server.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 23.21%. Comparing base (04b4a4b) to head (68b28d2).
⚠️ Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
...lment/roundtripperenrollmentconfirmation/client.go	0.00%	4 Missing ⚠️
...tripperenrollmentconfirmation/serverinverserole.go	0.00%	4 Missing ⚠️
...ort/internet/request/roundtripper/httprt/httprt.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3584      +/-   ##
==========================================
- Coverage   23.23%   23.21%   -0.02%     
==========================================
  Files         836      836              
  Lines       45434    45442       +8     
==========================================
- Hits        10555    10548       -7     
- Misses      33665    33675      +10     
- Partials     1214     1219       +5     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.