Reformatted & repositioned and improved doc about selinux #4
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On SELinux-enabled systems, /etc/hosts has a different type `net_conf_t` than the other files in /etc, so the temporary file that overwrites it ends up with the wrong context, resulting in many system services becoming unable to access the file. To fix this, manually look up the context /etc/hosts has and copy it to the temporary file before the rename. In order to avoid depending on libselinux on systems that don't use it, this support is gated behind the new "selinux" feature. It *is* installed and enabled in the Dockerfile, however, in order to ensure that it still builds.
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