Scripts: Add optional 'fix' argument to test-ocp-indent.sh

the script can be called with fix as argument to fix all indentation
problems in one go

scripts/test-ocp-indent.sh

@@ -1,7 +1,8 @@
-#!/bin/sh
+#!/bin/bash
 
 tmp_dir="$(mktemp -d -t tezos_build.XXXXXXXXXX)"
 failed=no
+fix=${1:-""}
 
 for f in  ` find \( -name _build -or \
                     -name .git -or \
@@ -12,8 +13,13 @@ for f in  ` find \( -name _build -or \
   ocp-indent $f > $tmp_dir/$ff
   diff -U 3 $f $tmp_dir/$ff
   if [ $? -ne 0 ]; then
+    if [ $fix = "fix" ]; then
+      echo "Fix indentation $f"
+      cp $tmp_dir/$ff $f
+    else
       failed=yes
     fi
+  fi
   rm -f $tmp_dir/$ff $tmp_dir/$ff.diff
 done