Minimal fix to make scope start with Docker for Mac again. #3140
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@dglaubman found that recent versions of Docker for Mac (Docker version 18.03.0-ce, build 0520e24) don't write out
${HOME}/Library/Containers/com.docker.docker/Data/database
any more.@foot confirmed this. A fresh installation of Docker for Mac (Version 18.03.0-ce-mac60 (23751), Channel: stable) did not create the file.
The result was that installations which had this leftover file could start scope, whereas newer couldn't. The fix simply changes this check to a path which actually exists.
Thanks @dglaubman and @foot for the analysis and confirmation.
Fixes #3064