Unquote ${ZPOOL_FORCE} variable usage.

The default value of ${ZPOOL_USAGE} is unset, quoting it would result into
a "" argument passed to zpool. The workaround to this is to use "dozfs=force"
boot argument.

Signed-off-by: Richard Yao <ryao@gentoo.org>

defaults/initrd.scripts

@@ -707,7 +707,7 @@ startVolumes() {
 		then
 			good_msg "Importing ZFS pools"
 
-			/sbin/zpool import -N -a "${ZPOOL_FORCE}"
+			/sbin/zpool import -N -a ${ZPOOL_FORCE}
 
 			if [ "$?" = '0' ]
 			then
@@ -725,12 +725,12 @@ startVolumes() {
 				then
 					good_msg "LUKS detected. Reimporting ${ZFS_POOL}"
 					/sbin/zpool export -f "${ZFS_POOL}"
-					/sbin/zpool import -N "${ZPOOL_FORCE}" "${ZFS_POOL}"
+					/sbin/zpool import -N ${ZPOOL_FORCE} "${ZFS_POOL}"
 				fi
 			else
 				good_msg "Importing ZFS pool ${ZFS_POOL}"
 
-				/sbin/zpool import -N "${ZPOOL_FORCE}" "${ZFS_POOL}"
+				/sbin/zpool import -N ${ZPOOL_FORCE} "${ZFS_POOL}"
 
 				if [ "$?" = '0' ]
 				then