Resolves #812

[LuNoX]

Resolves #812

All BaseClass definitions have been updated to Python3 style.
Previously, all BaseClasses were defined in a Python2 style having an explicit inheritance from object. This is no longer recommended with Python3.
As a result, all BaseClass definitions were changed to Python3 style.

[haifeng-jin]

Thanks for the PR!

[codecov]

Codecov Report

Base: 95.23% // Head: 95.23% // Decreases project coverage by -0.00% ⚠️

Coverage data is based on head (31637f5) compared to base (d07a23e).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #815      +/-   ##
==========================================
- Coverage   95.23%   95.23%   -0.01%     
==========================================
  Files          50       50              
  Lines        3168     3167       -1     
==========================================
- Hits         3017     3016       -1     
  Misses        151      151              

Impacted Files	Coverage Δ
keras_tuner/engine/conditions.py	88.46% <ø> (-0.22%)	⬇️
keras_tuner/distribute/oracle_client.py	95.65% <100.00%> (ø)
keras_tuner/engine/hypermodel.py	100.00% <100.00%> (ø)
...ras_tuner/engine/hyperparameters/hyperparameter.py	100.00% <100.00%> (ø)
...as_tuner/engine/hyperparameters/hyperparameters.py	100.00% <100.00%> (ø)
keras_tuner/engine/logger.py	80.35% <100.00%> (ø)
keras_tuner/engine/metrics_tracking.py	98.27% <100.00%> (ø)
keras_tuner/engine/stateful.py	100.00% <100.00%> (ø)
keras_tuner/engine/tuner_utils.py	88.58% <100.00%> (ø)
keras_tuner/protos/service_pb2_grpc.py	62.16% <100.00%> (ø)

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