fcoe/module-setup.sh: check() for needed tools

modules.d/95fcoe/module-setup.sh

@@ -8,6 +8,10 @@ check() {
     # knowing we are booting from FCoE
     [[ $hostonly ]] || [[ $mount_needs ]] && return 1
 
+    for i in dcbtool fipvlan lldpad ip readlink; do
+        type -P $i >/dev/null || return 1
+    done
+
     return 0
 }