Fuel CLI can not be run by non-root user

[Alexander Maretskiy]

api: '1.0'
astute_sha: b52910642d6de941444901b0f20e95ebbcb2b2e9
auth_required: true
build_id: 2014-08-12_10-52-56
build_number: '425'
feature_groups:
- mirantis
fuellib_sha: 54d834afccf1f8a97e4a82d7d081e7d1a1e068a1
fuelmain_sha: 9d4463400b4924159c978af43855e48bcf2a84b2
nailgun_sha: c7e00e5a00499d9f8dec608541dad1d745a8dd2e
ostf_sha: d2a894d228c1f3c22595a77f04b1e00d09d8e463
production: docker
release: '5.1'

Steps to reproduce:
  * having fuel node installed
  * add new non-root user and make login
  * run "fuel" CLI with arbitrary option (let it be "fuel env")

Expected:
  * output without errors

Actual:
$ fuel env
Traceback (most recent call last):
  File "/usr/bin/fuel", line 9, in <module>
    load_entry_point('fuelclient==0.2', 'console_scripts', 'fuel')()
  File "/usr/lib/python2.6/site-packages/pkg_resources.py", line 299, in load_entry_point
    return get_distribution(dist).load_entry_point(group, name)
  File "/usr/lib/python2.6/site-packages/pkg_resources.py", line 2229, in load_entry_point
    return ep.load()
  File "/usr/lib/python2.6/site-packages/pkg_resources.py", line 1948, in load
    entry = __import__(self.module_name, globals(),globals(), ['__name__'])
  File "/usr/lib/python2.6/site-packages/fuelclient/cli/parser.py", line 18, in <module>
    from fuelclient.cli.actions import actions
  File "/usr/lib/python2.6/site-packages/fuelclient/cli/actions/__init__.py", line 19, in <module>
    from fuelclient.cli.actions.deploy import DeployChangesAction
  File "/usr/lib/python2.6/site-packages/fuelclient/cli/actions/deploy.py", line 16, in <module>
    from fuelclient.cli.actions.base import Action
  File "/usr/lib/python2.6/site-packages/fuelclient/cli/actions/base.py", line 22, in <module>
    from fuelclient.client import APIClient
  File "/usr/lib/python2.6/site-packages/fuelclient/client.py", line 190, in <module>
    APIClient = Client()
  File "/usr/lib/python2.6/site-packages/fuelclient/client.py", line 48, in __init__
    with open(path_to_config, "r") as fh:
IOError: [Errno 13] Permission denied: '/etc/fuel/client/config.yaml'

NOTE:
  1) this is just a permission issue, the "chmod 644 /etc/fuel/client/config.yaml" solves the problem
  2) this problem is critical for auto-testing, when we deploy iso, then install and run some testing scripts (e.g. rally and tempest) - we also need to run fuel cli to obtain some data

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/135039
Committed: https://git.openstack.org/cgit/stackforge/fuel-web/commit/?id=5c9e53737c1b21e03ab9b272ff9796694a4787ff
Submitter: Jenkins
Branch: master

commit 5c9e53737c1b21e03ab9b272ff9796694a4787ff
Author: Dmitry Pyzhov <email address hidden>
Date: Mon Nov 17 20:54:52 2014 +0300

    Do not fail if client config file is not readable

    Also make environment variables to have higher priority then config
    file.

    DocImpact
    Change-Id: Ib4a395794bf08cda1307008005f6064198e36be8
    Closes-Bug: #1355876
    Closes-Bug: #1393750