add okta email mfa support

[tmesgong]

No description provided.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 42.23%. Comparing base (54e1e97) to head (37f0b63).
Report is 5 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1281      +/-   ##
==========================================
+ Coverage   42.08%   42.23%   +0.15%     
==========================================
  Files          54       54              
  Lines        6442     6442              
==========================================
+ Hits         2711     2721      +10     
+ Misses       3288     3274      -14     
- Partials      443      447       +4     

Flag	Coverage Δ
unittests	42.23% <100.00%> (+0.15%)	⬆️

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[mapkon]

@tmesgong the linter is failing.

[mapkon]

@tmesgong Do you mind adding some tests to this?

[tmesgong]

@mapkon I don't know how to test. It works for me. I follow the okta sms mfa code, but it doesn't have test. If there's similar test I can follow, I'd like add this later.

[mapkon]

Ideally, you should look at how the okta_test.go is designed and add a test to exercise your case for the code. I would concentrate on using the test to document the scenarios and state needed for EmailMfa to function properly.