The added debug information is stripped of during packaging, so it does not
increase the package size. It does however slightly change offsets in the
code, preventing the weird ash segfaults we've been seeing. Also, if the
issue returns, we'll have debug information matching the coredumps.
The staged sysupgrade allows to properly unmount the rootfs before writing
the new partitions. This will fix upgrades losing configuration when
parition sizes change on x86 and similar image types.
The ar71xx-tiny target sets CONFIG_CLEAN_IPKG, which would delete opkg
control files required for user creation. Fix image generation and the user
creation script.
Fixes#1012
