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6e9edd53b3
Symlinking busybox may fail when the test code and the test temporary directory live on different volumes/partitions; so we should copy instead. This situation arises in the Vagrant setup, where the code repository live on special file sharing volume. Somewhat unrelated, remove `f.Sync()` invocation from a test copyFile helper function. Sync is useful only for crash recovery, and isn't necessary in our test setup. The sync invocation is a significant overhead as it requires the OS to flush any cached writes to disk.