Fix hub subscription pod crash on invalid cert

[fxiang1]

• I have taken backward compatibility into consideration.

• Changed a FatalF message output to InfoF so the hub subscription pod doesn't crash when the user provide an invalid TLS certificate

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: fxiang1

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[fxiang1]

/uncc @jnpacker @mikeshng

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 55.68%. Comparing base (1a68f15) to head (61e7eee).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #422      +/-   ##
==========================================
- Coverage   55.96%   55.68%   -0.28%     
==========================================
  Files          96       96              
  Lines       15727    15727              
==========================================
- Hits         8801     8758      -43     
- Misses       6040     6088      +48     
+ Partials      886      881       -5     

Flag	Coverage Δ
unit	55.68% <ø> (-0.28%)	⬇️

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[fxiang1]

/cc @xiangjingli

[xiangjingli]

/lgtm