Closing embedded graph store with APOC causes stacktrace on Windows machines

[DirkMahler]

If APOC is used then the plugin is copied to a temp directory. While shutting the embedded graph store the directory is deleted (see destroy method). This fails occasionally on Windows machines (despite the database instance is already shutdown at this moment). If this occurs then a warning including a full stacktrace is logged. This may imply to the user that the build failed, which is not the case.

Therefore the warning should be reduced to the message without the stacktrace.