only save contrib/internal/logging's py

Author: joeyzhao2018

Dockerfile

@@ -50,7 +50,9 @@ RUN PYTHONNODEBUGRANGES=1 python -OO -m compileall -b ./python/lib/$runtime/site
 # remove all .py files except ddtrace/contrib/*/__init__.py which are necessary
 # for ddtrace.patch to discover instrumationation packages.
 RUN find ./python/lib/$runtime/site-packages -name \*.py | grep -v ddtrace/contrib | xargs rm -rf
-# RUN find ./python/lib/$runtime/site-packages/ddtrace/contrib -name \*.py | grep -v __init__ | xargs rm -rf
+RUN find ./python/lib/$runtime/site-packages/ddtrace/contrib -name "*.py" \
+    -not -path "./python/lib/$runtime/site-packages/ddtrace/contrib/internal/logging/*" \
+    | grep -v __init__ | xargs rm -rf
 RUN find ./python/lib/$runtime/site-packages -name __pycache__ -type d -exec rm -r {} \+
 
 # When building ddtrace from branch, remove extra source files.  These are