Created command to generate subscriptions for user without payment

[renzon]

close #3775

[codecov]

Codecov Report

Merging #3776 (1de5d44) into master (554d11c) will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #3776      +/-   ##
==========================================
+ Coverage   95.76%   95.79%   +0.03%     
==========================================
  Files         234      235       +1     
  Lines        6657     6713      +56     
==========================================
+ Hits         6375     6431      +56     
  Misses        282      282              

Impacted Files	Coverage Δ
...agement/commands/create_subscriptions_for_roles.py	100.00% <100.00%> (ø)
pythonpro/memberkit/tests/test_commands.py	100.00% <100.00%> (ø)

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