[Findit] Add iterator and crash_iterator for delta test

appengine/findit/util_scripts/crash_queries/README.md

Index: appengine/findit/util_scripts/crash_queries/README.md
diff --git a/appengine/findit/util_scripts/crash_queries/README.md b/appengine/findit/util_scripts/crash_queries/README.md
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+###################### Set up enviroment variables. #####################
+##!/bin/bash
+#
+## Notice:
+## Source this script to setup the PYTHONPATH and other environment settings for
+## pulling data from ClusterFuzz through App Engine Remote API. Command:
+##   source setup_enviroments.sh
+##   . setup_enviroments.sh

[wrengr, 2016/10/05 18:41:58]

should be "setup_environment"; the plural is weird.

But also, no such file exists. I'd suggest `source README.md` except that
everything here is commented out.

[Sharu Jiang, 2016/10/06 18:16:56]

This is the practice I used in delta test in clusterfuzz, so people won't
accidentally check in their paths, instead they can make their own local .sh
copy.

[wrengr, 2016/10/06 19:20:08]

That makes sense. It'd be clearer if there were ##-comments explaining that
users should copy the file to setup_environment.sh and customize the path
values, as part of the directions prior to the ##-comment about sourcing it.

+#
+## This must be set to the directory in which Findit source code is
+## checked out, eg: ~/chrome-internal if the checkout is in
+## ~/chrome-internal/findit.
+#export FINDIT_ROOT_DIR='root/path/to/findit'
+#
+## Since findit don't want to cover the tests of

[wrengr, 2016/10/05 18:41:58]

"don't" -> "doesn't"

"the tests of"... of what?

[Sharu Jiang, 2016/10/06 18:16:56]

Done.

+#export UTIL_SCRIPTS_DIR=$FINDIT_ROOT_DIR/util_scripts
+#
+##This must be set to the third_party directory under findit.
+#export THIRD_PARTY_DIR=${FINDIT_ROOT_DIR}/third_party
+#
+## This must be set to your appengine SDK directory.
+#APPENGINE_SDK_DIR='path/to/google_appengine'
+#
+#if [[ $PYTHONPATH != *$APPENGINE_SDK_DIR* ]]
+#then
+#  export PYTHONPATH=$UTIL_SCRIPTS_DIR:$FINDIT_ROOT_DIR:$THIRD_PARTY_DIR:$APPENGINE_SDK_DIR
+#fi
+#
+## This should be set to your app id.
+#export APP_ID="your app id"
+#
+## This must be set to the directory to put local checkout in.
+#export CHECKOUT_ROOT_DIR='path/to/checkout/root/path'