Changed certificate serverName to pod+namespace

[MuhammadQadora]

Description

Changed podName to podName.namespace in the tls.config in secrets.go so that is it possible to issue *.namespace wildcard TLS certificate with cert-manager.

Fixes #763
Type of change

• Bug fix (non-breaking change which fixes an issue)
  Checklist

• Tests have been added/modified and all tests pass.
• [*] Functionality/bugs have been confirmed to be unchanged or fixed.
• [*] I have performed a self-review of my own code.
• [*] Documentation has been updated or added where necessary.

Additional Context

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 29.64%. Comparing base (60ef5a2) to head (caa22eb).
Report is 36 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1221      +/-   ##
==========================================
- Coverage   30.20%   29.64%   -0.56%     
==========================================
  Files          55       57       +2     
  Lines        6294     6658     +364     
==========================================
+ Hits         1901     1974      +73     
- Misses       4200     4498     +298     
+ Partials      193      186       -7     

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