Fix rpc output to be decoded into rpc output entity

[ghost]

#332

[codecov-io]

Codecov Report

Merging #471 into master will increase coverage by 0.13%.
The diff coverage is 82.53%.

@@            Coverage Diff             @@
##           master     #471      +/-   ##
==========================================
+ Coverage   83.91%   84.05%   +0.13%     
==========================================
  Files         109      109              
  Lines       13021    13050      +29     
  Branches     1883     1885       +2     
==========================================
+ Hits        10927    10969      +42     
+ Misses       1571     1562       -9     
+ Partials      523      519       -4

Impacted Files	Coverage Δ
ydkgen/printer/python/namespace_printer.py	98.52% <100%> (+2.81%)	⬆️
sdk/python/core/ydk/providers/_encoder.py	88.88% <100%> (ø)	⬆️
sdk/python/core/tests/test_sanity_rpc.py	90.56% <100%> (ø)	⬆️
sdk/python/core/ydk/providers/_provider_plugin.py	73.3% <66.66%> (+1%)	⬆️
sdk/python/core/ydk/services/netconf_service.py	86.76% <70%> (-1.95%)	⬇️
sdk/python/core/ydk/providers/_decoder.py	72.93% <96.42%> (+4.44%)	⬆️
ydkgen/builder/test_case/test_cases_builder.py	80.93% <0%> (-1.08%)	⬇️
...cases/python/expected/ydk/models/ydktest_sanity.py	74.67% <0%> (ø)	⬆️
.../test-cases/python/expected/ydk/models/_yang_ns.py	100% <0%> (ø)	⬆️
ydkgen/api_model.py	82.8% <0%> (+0.17%)	⬆️
... and 2 more

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