Switch to using integer IDs instead of UUIDs

[daviddavis]

No description provided.

[codecov]

Codecov Report

Merging #3549 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #3549      +/-   ##
==========================================
+ Coverage   58.08%   58.09%   +<.01%     
==========================================
  Files          59       59              
  Lines        2460     2453       -7     
==========================================
- Hits         1429     1425       -4     
+ Misses       1031     1028       -3

Impacted Files	Coverage Δ
pulpcore/pulpcore/app/settings.py	98.38% <ø> (ø)	⬆️
pulpcore/pulpcore/app/models/auth.py	58.33% <ø> (-3.21%)	⬇️
pulpcore/pulpcore/app/tasks/repository.py	37.03% <ø> (ø)	⬆️
pulpcore/pulpcore/app/models/base.py	56.86% <ø> (-1.63%)	⬇️
pulpcore/pulpcore/app/viewsets/base.py	76.69% <ø> (-0.76%)	⬇️
pulpcore/pulpcore/app/viewsets/custom_filters.py	47.61% <ø> (+5.31%)	⬆️
pulpcore/pulpcore/app/models/task.py	57.4% <100%> (+0.8%)	⬆️
pulpcore/pulpcore/app/pagination.py	100% <100%> (ø)	⬆️
pulpcore/pulpcore/app/viewsets/repository.py	70.62% <100%> (ø)	⬆️
pulpcore/pulpcore/app/models/generic.py	86.36% <100%> (ø)	⬆️
... and 1 more

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[dralley]

LGTM and tests pass