fix tools/clean_all_makefile & add tools/clean_all_examples

Change-Id: Icc47b49cc26ac57e0cb1b2855bc87fcd6afd311a

tools/clean_all_examples

+saved_pwd_before_making=$PWD
+for file in `find example -name Makefile`; do
+    cd $(dirname $file)
+    echo -e "\n[$file]"
+    make -s clean
+    cd $saved_pwd_before_making
+done

tools/clean_all_makefile

-#!/bin/bash
-saved_pwd_before_making=$PWD
-for file in `find . -name Makefile`; do
-    cd $(dirname $file)
-    echo -e "\n[$file]"
-    make -s clean
-    cd $saved_pwd_before_making
-done
-#!/bin/bash
 saved_pwd_before_making=$PWD
 for file in `find . -name Makefile`; do
     cd $(dirname $file)