Include the actuall callback retry script

tools/scripts/callback_retry.sh

@@ -0,0 +1,24 @@
+#!/bin/bash
+
+usage() {
+  echo -e "Retry callback attempt if we don't receive a 202 response from the Tower API\n"
+  echo "Usage: $0 <server address>[:server port] <host config key> <job template id>"
+  exit 1
+}
+
+[ $# -lt 3 ] && usage
+
+retry_attempts=5
+attempt=0
+while [[ $attempt < $retry_attempts ]]
+do
+  status_code=`curl -s -i --data "host_config_key=$2" http://$1/api/v1/job_templates/$3/callback/ | head -n 1 | awk '{print $2}'`
+  if [[ $status_code == 202 ]]
+    then
+    exit 0
+  fi
+  attempt=$(( attempt + 1 ))
+  echo "${status_code} received... retrying."
+  sleep 5
+done
+exit 1