contrib/dracut: zfs-lib: export_all: replace with inline zpool export -a

07a3312f17, which introduced this in
October of 2014, didn't have zpool export -a available; we do

Upstream-commit: 6a41310c70
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Closes #13093

contrib/dracut/90zfs/zfs-lib.sh.in

@@ -121,22 +121,6 @@ for_relevant_root_children() {
         )
 }
 
-# export_all OPTS
-#   exports all imported zfs pools.
-export_all() {
-    ret=0
-
-    IFS="${NEWLINE}"
-    for pool in $(zpool list -H -o name) ; do
-        if zpool list -H "${pool}" > /dev/null 2>&1; then
-            zpool export "${pool}" "$@" || ret=$?
-        fi
-    done
-    IFS="${OLDIFS}"
-
-    return ${ret}
-}
-
 # ask_for_password
 #
 # Wraps around plymouth ask-for-password and adds fallback to tty password ask