Mmdet scnet support

[ganesh3]

Added support for scnet

[codecov]

Codecov Report

❌ Patch coverage is 95.45455% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 85.77%. Comparing base (b4a4148) to head (079b4bb).
⚠️ Report is 52 commits behind head on master.

Files with missing lines	Patch %	Lines
icevision/parsers/parser.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #921      +/-   ##
==========================================
+ Coverage   85.71%   85.77%   +0.05%     
==========================================
  Files         255      258       +3     
  Lines        5658     5679      +21     
==========================================
+ Hits         4850     4871      +21     
  Misses        808      808              

Flag	Coverage Δ
unittests	85.77% <95.45%> (+0.05%)	⬆️

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[FraPochetti]

@ai-fast-track shall we merge this one?