Fix RPC output to be decoded to entity; Single instance of list in read output needs to be returned as a list

[ghost]

Fixes #332
Fixes #457

[codecov-io]

Codecov Report

Merging #459 into master will decrease coverage by 0.13%.
The diff coverage is 78.57%.

@@            Coverage Diff             @@
##           master     #459      +/-   ##
==========================================
- Coverage   83.58%   83.44%   -0.14%     
==========================================
  Files         109      109              
  Lines       13104    13116      +12     
  Branches     1923     1932       +9     
==========================================
- Hits        10953    10945       -8     
- Misses       1593     1612      +19     
- Partials      558      559       +1

Impacted Files	Coverage Δ
sdk/python/core/ydk/services/netconf_service.py	88.7% <100%> (+2.14%)	⬆️
sdk/python/core/ydk/services/executor_service.py	100% <100%> (ø)	⬆️
...dk/python/core/tests/test_sanity_service_errors.py	76.54% <100%> (ø)	⬆️
sdk/python/core/tests/test_sanity_netconf.py	96.12% <100%> (ø)	⬆️
sdk/python/core/tests/test_sanity_rpc.py	90.56% <100%> (ø)	⬆️
sdk/python/core/ydk/providers/_decoder.py	68.48% <35.71%> (-2.25%)	⬇️
sdk/python/core/ydk/providers/_provider_plugin.py	72.3% <63.63%> (-0.17%)	⬇️
ydkgen/printer/python/namespace_printer.py	95.71% <77.77%> (-2.7%)	⬇️
ydkgen/builder/test_case/test_cases_builder.py	77.69% <0%> (-4.32%)	⬇️
ydkgen/builder/test_case/test_value_builder.py	91.21% <0%> (ø)	⬆️

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