fix(check_live_ram): increase /run tmpfs size, if needed #17
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Check the size and available space in /run to enlarge it,
if needed.
Introduce the check_meminfo() function to dracut-lib.sh
to replace a less versatile sed call.
Also, use local variables,
use parameter expansion to assign a default value,
use test exit logic directly, where possible,
tweak comments,
and move the check_live_ram() function to img-lib.sh.
(Cherry-picked commit from dracutdevs/dracut#2551)