[tools] Add a tool to grep local repos

Sean wanted to know which repos still use mox/mox 3 which can be done
with this tool like:

tools/code-search.sh --prefix ~/projects/openstack/ \
                     --projects ~/projects/openstack/*/* \
                     -- mox origin/master -- *requirements.txt setup.cfg

The prefix is essentially a sting to remove from the project name.  So
the example above would change:

/home/tony/projects/openstack/openstack/astara => openstack/astara

Change-Id: I927bc96b6eafd2d95dc008b7f1a4374eb9f725b4

tools/README.txt

@@ -28,6 +28,10 @@ Used in tox environment pip-install.  Only installs requirements (as opposed to
 test-requirements and verifies that all console-scripts have all modules
 needed.
 
+code-search.sh
+--------------
+Assuming you have a set of local git repos grep them all for interesting things.
+
 cruft.sh
 --------
 

tools/code-search.sh

@@ -0,0 +1,48 @@
+#!/usr/bin/env bash
+
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+
+declare -a projects
+in_projects=0
+base=$HOME
+
+while [ $# -gt 1 ] ; do
+    case "$1" in
+    --prefix)
+        prefix=$2
+        shift 1
+    ;;
+    --projects)
+        in_projects=1
+    ;;
+    --)
+        break
+    ;;
+    *)
+        if [ "$in_projects" == 1 ] ; then
+            projects+=($1)
+        else
+            echo Unknown arg/context >&2
+            exit 1
+        fi
+    ;;
+    esac
+    shift 1
+done
+
+for prj in ${projects[@]} ; do
+    (
+    cd $prj>/dev/null 2>&1 && \
+        git grep -HEin $@ 2>/dev/null|sed -e "s,^,${prj#$prefix}:,g"
+    )
+done