Non-string inputs cause error in os-refresh-config

Given the template fragment below, which passes an integer input value to a heat SW config deployment, os-refresh-config fails with the error:

[2014-06-24 19:08:01,663] (heat-config) [DEBUG] Running /var/lib/heat-config/heat-config-script/1f618dbe-8384-4e7c-9083-2a6724140005
Traceback (most recent call last):
  File "/var/lib/heat-config/hooks/script", line 79, in <module>
    sys.exit(main(sys.argv))
  File "/var/lib/heat-config/hooks/script", line 49, in main
    stderr=subprocess.PIPE, env=env)
  File "/usr/lib/python2.7/subprocess.py", line 709, in __init__
    errread, errwrite)
  File "/usr/lib/python2.7/subprocess.py", line 1326, in _execute_child
    raise child_exception
TypeError: execve() arg 3 contains a non-string value

If `input1` is changed to "100", it works as expected. The bug is in 55-heat-config; it needs to iterate over c['inputs'] and replace all "value"s with their string arguments.

heat_template_version: '2013-05-23'

resources:
  execve:
    properties:
      flavor: m1.small
      image: Ubuntu 13.10 Heat SW config
      key_name: devstack
      user_data_format: SOFTWARE_CONFIG
    type: OS::Nova::Server

  execve-test_heat_sw:
    properties:
      config: '#!/bin/bash

       echo "Input values was input1" | tee /tmp/test-heat.txt

      '

      group: script
      inputs:
        - name: input1

    type: OS::Heat::SoftwareConfig
  execve-test_heat_sw_deployment:
    properties:
      config: {get_resource: execve-test_heat_sw}
      server: {get_resource: execve}
      input_values:
        input1: 100
    type: OS::Heat::SoftwareDeployment