alpine,debian: fix tests/modules race on non-module arches; make pip conditional in Alpine#471

adobrzhansky merged 2 commits intoredis:unstableredis/docker-library-redis:unstablefrom

mike-golant:fix/llvm-libclang-for-modulesmike-golant/docker-library-redis:fix/llvm-libclang-for-modulesCopy head branch name to clipboard