Add unofficial submission setting

[codecov-commenter]

Codecov Report

Merging #26 (9fd98dc) into master (43f8a61) will increase coverage by 0.24%. The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master      #26      +/-   ##
==========================================
+ Coverage   63.69%   63.93%   +0.24%     
==========================================
  Files         234      234              
  Lines       17177    17196      +19     
==========================================
+ Hits        10941    10995      +54     
+ Misses       6236     6201      -35     

Flag	Coverage Δ
functionaltests	47.93% <66.66%> (+0.26%)	:arrow_up:
unittests	44.27% <33.33%> (+0.02%)	:arrow_up:

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Impacted Files	Coverage Δ
cms/server/contest/handlers/tasksubmission.py	50.26% <50.00%> (+0.80%)	:arrow_up:
cms/db/contest.py	89.85% <100.00%> (+0.14%)	:arrow_up:
cms/server/admin/handlers/contest.py	69.49% <100.00%> (+0.26%)	:arrow_up:
cms/server/contest/handlers/contest.py	87.37% <0.00%> (-3.89%)	:arrow_down:
cms/db/submission.py	97.43% <0.00%> (-1.03%)	:arrow_down:
cms/grading/Sandbox.py	68.88% <0.00%> (-0.70%)	:arrow_down:
cmscontrib/AddStatement.py	78.78% <0.00%> (-0.06%)	:arrow_down:
cms/db/filecacher.py	79.51% <0.00%> (+0.30%)	:arrow_up:
cms/io/rpc.py	94.55% <0.00%> (+0.34%)	:arrow_up:
cms/io/service.py	73.33% <0.00%> (+0.60%)	:arrow_up:
... and 11 more

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[aguss787]

@fushar yes, the submission windows should be exactly the same as the one that the contestant have during the contest.