[Merge] ~alexghiti/livecd-rootfs:int/alex/riscv_wpasupplicant into livecd-rootfs:ubuntu/master

[Łukasz Zemczak]

Review: Approve

This is good, I merged it already. I did add one small thing on top: I changed the case statement to `case "$ARCH${SUBARCH:++$SUBARCH}" in`. The reasoning is that basically we want to preinstall wpasupplicant on all the *devices* we build for - but the CPC team, I think, still build standard riscv64 cloud images, and we don't want to pull wpasupplicant there without them knowing. This way we can still do `riscv*+*)` and not risk getting it added for images with no SUBARCH.
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https://code.launchpad.net/~alexghiti/livecd-rootfs/+git/livecd-rootfs/+merge/427545
Your team Ubuntu Core Development Team is requested to review the proposed merge of ~alexghiti/livecd-rootfs:int/alex/riscv_wpasupplicant into livecd-rootfs:ubuntu/master.