Fix #4347: Flag for submissions UI and CLI

[Harshit28j]

This PR resolves #4347

If submission is made through UI:

If submission is made through CLI:

[Harshit28j]

@RishabhJain2018, could you please review the PR?

[gchhablani]

Reviewed this PR. Please make the changes.
Also, you will have to update the variable when the submissions are pushed to evalai. Plesae make those changes are well.

[RishabhJain2018]

Please fix the build as well : https://app.travis-ci.com/github/Cloud-CV/EvalAI/builds/270091034

[Harshit28j]

The addition of 'from_cli' to models.py and database migration have caused build failure. This is because the existing tests were designed for the previous database schema.
To resolve this, Add updated test cases as per new db schema

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 69.30%. Comparing base (96968d6) to head (e687dc0).
Report is 1110 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4349      +/-   ##
==========================================
- Coverage   72.93%   69.30%   -3.63%     
==========================================
  Files          83       20      -63     
  Lines        5368     3574    -1794     
==========================================
- Hits         3915     2477    -1438     
+ Misses       1453     1097     -356     

see 64 files with indirect coverage changes

see 64 files with indirect coverage changes

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