Support usr-merged root filesystems #2485
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Note this is based on top of #2484
Why
Some linux distros, such as AzureLinux, are usr-merged meaning that binaries are not where containerplat will expect them to be. This means we need to create symlinks from the usr directory to /bin.
How
When constructing delta.tar.gz, detect if the input rootfs is usr merged, if it isn't, keep the existing behaviour, otherwise create /usr/bin instead of /bin and then symlink.