Python: change generated package name

[landrito]

Updates #1320

[codecov-io]

Codecov Report

Merging #1507 into master will decrease coverage by 0.01%.
The diff coverage is 80%.

@@             Coverage Diff              @@
##             master    #1507      +/-   ##
============================================
- Coverage     86.93%   86.91%   -0.02%     
- Complexity     4111     4112       +1     
============================================
  Files           404      404              
  Lines         16565    16574       +9     
  Branches       1761     1762       +1     
============================================
+ Hits          14400    14406       +6     
- Misses         1681     1683       +2     
- Partials        484      485       +1

Impacted Files	Coverage Δ	Complexity Δ
...ansformer/py/PythonPackageMetadataTransformer.java	97.48% <100%> (+0.04%)	36 <0> (ø)	⬇️
...api/codegen/transformer/py/PythonSurfaceNamer.java	90.98% <66.66%> (-1.26%)	57 <2> (+2)
...m/google/api/codegen/transformer/SurfaceNamer.java	76.5% <0%> (-0.32%)	181% <0%> (-1%)

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