[explorer/interfaces] Always sort output

Before, only the output of ifconfig was sorted.

cdist/conf/explorer/interfaces

@@ -18,13 +18,11 @@
 # along with cdist. If not, see <http://www.gnu.org/licenses/>.
 #
 
-if command -v ip > /dev/null
+if command -v ip >/dev/null
 then
-    ip -o link show | sed -n 's/^[0-9]\+: \(.\+\): <.*/\1/p'
-
-elif command -v ifconfig > /dev/null
+	ip -o link show | sed -n 's/^[0-9]\+: \(.\+\): <.*/\1/p'
+elif command -v ifconfig >/dev/null
 then
-    ifconfig -a \
-        | sed -n -E 's/^(.*)(:[[:space:]]*flags=|Link encap).*/\1/p' \
-        | sort -u
-fi
+	ifconfig -a | sed -n -E 's/^(.*)(:[[:space:]]*flags=|Link encap).*/\1/p'
+fi \
+ | sort -u