Support XML attributes with namespaces

[lmazuel]

No description provided.

[codecov-commenter]

Codecov Report

Merging #209 into master will increase coverage by 1.46%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #209      +/-   ##
==========================================
+ Coverage   82.57%   84.04%   +1.46%     
==========================================
  Files          25       25              
  Lines        2669     2670       +1     
==========================================
+ Hits         2204     2244      +40     
+ Misses        465      426      -39     

Impacted Files	Coverage Δ
msrest/serialization.py	85.49% <100.00%> (+2.93%)	⬆️
msrest/universal_http/__init__.py	74.09% <0.00%> (+1.03%)	⬆️
msrest/pipeline/__init__.py	91.20% <0.00%> (+1.60%)	⬆️
msrest/pipeline/universal.py	93.13% <0.00%> (+1.96%)	⬆️
msrest/exceptions.py	87.34% <0.00%> (+2.53%)	⬆️
msrest/paging.py	91.22% <0.00%> (+3.50%)	⬆️

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