legacy/lxc-ls: use posix shell instead of bash

src/lxc/legacy/lxc-ls.in

-#!/bin/bash
+#!/bin/sh
 
 #
 # lxc: linux Container library
@@ -35,8 +35,6 @@ help() {
 
 get_parent_cgroup()
 {
-	local hierarchies hierarchy fields subsystems init_cgroup mountpoint
-
 	parent_cgroup=""
 
 	# Obtain a list of hierarchies that contain one or more subsystems
@@ -61,11 +59,10 @@ get_parent_cgroup()
 
 		# Return the absolute path to the containers' parent cgroup
 		# (do not append '/lxc' if the hierarchy contains the 'ns' subsystem)
-		if [[ ",$subsystems," == *,ns,* ]]; then
-			parent_cgroup="${mountpoint}${init_cgroup%/}"
-		else
-			parent_cgroup="${mountpoint}${init_cgroup%/}/lxc"
-		fi
+		case ",$subsystems," in
+			*,ns,*) parent_cgroup="${mountpoint}${init_cgroup%/}";;
+			*) parent_cgroup="${mountpoint}${init_cgroup%/}/lxc";;
+		esac
 		break
 	done
 }
@@ -82,12 +79,12 @@ for i in "$@"; do
 			shift; break;;
 		*)
 			break;;
-        esac
+	esac
 done
 
 containers=""
 if [ ! -z "$directory" ]; then
-	containers=$(find $directory -mindepth 1 -maxdepth 1 -type d -printf "%f\n" 2>/dev/null)
+	containers=$(find $directory -mindepth 1 -maxdepth 1 -type d 2>/dev/null | sed 's:.*/::')
 fi
 
 cd "$directory"