treewide: use new procd sysupgrade $UPGRADE_BACKUP variable
It's a variable set by procd that should replace hardcoded
/tmp/sysupgrade.tgz.
This change requires the most recent procd with the commit 0f3c136
("sysupgrade: set UPGRADE_BACKUP env variable").
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
(cherry picked from commit 641f6b6c26
)
v19.07.3_mercusys_ac12_duma
parent
1b9a4f0cb4
commit
a717428828
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