Quote username in SCRAM auth

[ods]

Based on wbarnha/kafka-python-ng#196

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.02%. Comparing base (e2afc03) to head (9812e86).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1043      +/-   ##
==========================================
- Coverage   95.04%   95.02%   -0.03%     
==========================================
  Files         114      114              
  Lines       16970    16971       +1     
  Branches     2771     2771              
==========================================
- Hits        16129    16126       -3     
- Misses        494      497       +3     
- Partials      347      348       +1     

Flag	Coverage Δ
cext	91.94% <100.00%> (+<0.01%)	⬆️
integration	94.67% <100.00%> (-0.03%)	⬇️
purepy	94.49% <100.00%> (-0.03%)	⬇️
unit	52.87% <0.00%> (-0.01%)	⬇️

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