base-files: prevent issues w/ overlay on powerloss after sysupgrade
Due to filesystem write caching the old configuration data could stay out of flash for a long time during a first boot after the sysupgrade. Power loss during this period could damage the overlay data and even make device inaccessable via the network. Fix this by syncing data to a flash as soon as the previous configuration will be unpacked after the sysupgrade. Also sync the FS state after the sysupgrade.tgz archive removing to prevent duplicative extraction of a previous configuration. Tested with AMD Geode based board. Signed-off-by: Sergey Ryazanov <ryazanov.s.a@gmail.com>master
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