Migrate from xblock-utils package to xblock.utils

[farhan]

ticket: #414

[codecov]

Codecov Report

Attention: 7 lines in your changes are missing coverage. Please review.

Comparison is base (c5d9a5f) 97.95% compared to head (402a2a8) 97.84%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #417      +/-   ##
==========================================
- Coverage   97.95%   97.84%   -0.11%     
==========================================
  Files          77       77              
  Lines        6686     6696      +10     
==========================================
+ Hits         6549     6552       +3     
- Misses        137      144       +7     

Flag	Coverage Δ
unittests	97.84% <53.33%> (-0.11%)	⬇️

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Files	Coverage Δ
lti_consumer/__init__.py	100.00% <100.00%> (ø)
lti_consumer/lti_1p1/contrib/django.py	80.00% <50.00%> (-6.37%)	⬇️
lti_consumer/outcomes.py	97.75% <50.00%> (-2.25%)	⬇️
lti_consumer/lti_xblock.py	96.08% <50.00%> (-0.57%)	⬇️

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