return stdout from executed scripts to install method

I am expanding the usage of the install method to
do more things than just install puppet. For these purposes,
I need to see stdout from the ssh_remote_execute of the script.

This commit adds a key stdout to the hash returned by the install
method.
Merge branch 'bodepd-install_return_stdout'

* bodepd-install_return_stdout:
  return stdout from executed scripts to install method

closes #95