ref: set binary-path for pyuwsgi to be reloadable

[asottile-sentry]

I regressed reloadability in #3076 (a reload would cause uwsgi to lose the virtualenv)

see also unbit/uwsgi#2478

[codecov-commenter]

Codecov Report

Base: 93.08% // Head: 93.02% // Decreases project coverage by -0.05% ⚠️

Coverage data is based on head (7ed0ad8) compared to base (f28d52f).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3101      +/-   ##
==========================================
- Coverage   93.08%   93.02%   -0.06%     
==========================================
  Files         662      662              
  Lines       30483    30483              
==========================================
- Hits        28374    28356      -18     
- Misses       2109     2127      +18     

Impacted Files	Coverage Δ
snuba/utils/uwsgi.py	26.92% <ø> (ø)
snuba/settings/settings_distributed.py	0.00% <0.00%> (-100.00%)	⬇️
snuba/settings/settings_test_distributed.py	0.00% <0.00%> (-100.00%)	⬇️
...ts/0010_groupedmessages_onpremise_compatibility.py	95.55% <0.00%> (-4.45%)	⬇️
snuba/migrations/table_engines.py	95.50% <0.00%> (-3.38%)	⬇️
snuba/optimize.py	89.10% <0.00%> (-2.98%)	⬇️
...nsactions_onpremise_fix_orderby_and_partitionby.py	81.33% <0.00%> (-2.67%)	⬇️
tests/migrations/test_runner_individual.py	91.20% <0.00%> (-2.20%)	⬇️
snuba/clusters/cluster.py	95.17% <0.00%> (-1.38%)	⬇️

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