Add retries on the get request of get_transform_status function

[kyungeonchoi]

• Add retries (5 times with 3 sec sleep) on the get request of get_transform_status function
• This can fix the issue Protect client against bad replies when requesting transform status from server #450

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.40%. Comparing base (e681796) to head (5bc0c40).
Report is 27 commits behind head on 3.0_develop.

Additional details and impacted files

@@               Coverage Diff               @@
##           3.0_develop     #469      +/-   ##
===============================================
+ Coverage        82.32%   83.40%   +1.07%     
===============================================
  Files               26       26              
  Lines             1386     1440      +54     
===============================================
+ Hits              1141     1201      +60     
+ Misses             245      239       -6     

Flag	Coverage Δ
unittests	83.40% <100.00%> (+1.07%)	⬆️

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[gordonwatts]

I think there is only one change that needs to happen now - the 10 second minimum for the backoff. I'm worried how long 5 failures will take if you have something like transform not found (which happens when you re-run things). Also, please create an issue for us to restrict the retry exceptions. The blanket means anything else goes wrong and the system will "hang" while it keep re-trying.

[gordonwatts]

This looks good now. Please add an issue for follow up.