Simplify by removing unnecessary class dummy

[jdufresne]

Was simply an alias of class object(). Use that instead.

Pull Request check-list

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• Does $ tox pass with this change (including linting)?
• Does travis tests pass with this change (enable it first in your forked repo and wait for the travis build to finish)?
• Is the new or changed code fully tested?
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[codecov-io]

Codecov Report

Merging #1320 into master will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1320      +/-   ##
==========================================
- Coverage   92.82%   92.81%   -0.01%     
==========================================
  Files          19       19              
  Lines        6533     6530       -3     
==========================================
- Hits         6064     6061       -3     
  Misses        469      469              

Impacted Files	Coverage Δ
redis/utils.py	64.28% <ø> (-4.47%)	⬇️
redis/lock.py	100.00% <100.00%> (ø)

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[andymccurdy]

The dummy class exists because instances of object prevent attribute assignment. The line immediately following assigns to the token attribute of the object. That will fail on an instance of object.

[jdufresne]

Thanks for pointing this out. I did not know about this aspect of object() classes.

I added a test that would have caught this earlier in #1326

[andymccurdy]

Perfect, thanks.