Move is_whitelisted to the common script so that all users get the previous fix

src/scripts/common.sh

Index: src/scripts/common.sh
diff --git a/src/scripts/common.sh b/src/scripts/common.sh
index bad8dd42aa33b465319c2a7fdd84b050c21eee79..2a3c5d25a5cc66e7e24601746efc6e6cc2169dae 100644
--- a/src/scripts/common.sh
+++ b/src/scripts/common.sh
@@ -190,3 +190,17 @@ function install_if_missing {
     sudo apt-get --yes --force-yes install $PKG_NAME
   fi
 }
+
+# Returns true if the input file is whitelisted.
+#
+# $1 - The file to check
+is_whitelisted() {
+  local file=$1  
+  local whitelist="$FLAGS_whitelist"
+  test -f "$whitelist" || (echo "Whitelist file missing ($whitelist)" && exit 1)
+
+  local checksum=$(md5sum "$file" | awk '{ print $1 }')
+  local count=$(sed -e "s/#.*$//" "${whitelist}" | grep -c "$checksum" \
+                || /bin/true)
+  test $count -ne 0
+}