Description of problem:
If you mistakenly run the undercloud install as root, it all runs and then fails at the last step (probably a non-critical failure, but it's not a great user experience)

Version-Release number of selected component (if applicable):
instack-undercloud-2.1.2-21.el7ost.noarch
instack-0.0.7-1.el7ost.noarch


How reproducible:
Always

Steps to Reproduce:
1. Follow the docs, but forget to su - stack before doing the undercloud install

Actual results:
[2015-07-17 09:58:42,373] (os-refresh-config) [INFO] Completed phase post-configure
os-refresh-config completed successfully
Copy stackrc failed: cp: ‘/root/stackrc’ and ‘/root/stackrc’ are the same file

Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/usr/lib/python2.7/site-packages/instack_undercloud/undercloud.py", line 527, in install
    _configure_ssh_keys()
  File "/usr/lib/python2.7/site-packages/instack_undercloud/undercloud.py", line 491, in _configure_ssh_keys
    _run_command(args, name='Copy stackrc')
  File "/usr/lib/python2.7/site-packages/instack_undercloud/undercloud.py", line 274, in _run_command
    env=env)
  File "/usr/lib64/python2.7/subprocess.py", line 575, in check_output
    raise CalledProcessError(retcode, cmd, output=output)
subprocess.CalledProcessError: Command '['sudo', 'cp', '/root/stackrc', '/root']' returned non-zero exit status 1
ERROR: openstack Command 'instack-install-undercloud' returned non-zero exit status 1

Expected results:
Either we should error at the start saying don't do this as root, or we should tolerate it and not fail copying files at the end.

Additional info: