Not all commands in fuel upgrade script has stderr redirection

[Maksym Strukov]

From this: https://bugs.launchpad.net/fuel/+bug/1480282

System test showed following error message:

===
Traceback
... skipped ...
AssertionError: Upgrade script fails with next message {here must be stderr output}
===

But fuel-upgrade.log contain more usable error message:

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2015-07-31 05:37:49 ERROR 6464 (upgrade) HostSystemUpgrader: failed to upgrade: "Shell command executed with "1" exit code: yum install -v -y fuel-7.0.0 "
Traceback (most recent call last):
  File "/var/upgrade/.fuel-upgrade-venv/lib/python2.6/site-packages/fuel_upgrade/upgrade.py", line 82, in run
    upgrader.upgrade()
  File "/var/upgrade/.fuel-upgrade-venv/lib/python2.6/site-packages/fuel_upgrade/engines/host_system.py", line 97, in upgrade
    self.install_packages()
  File "/var/upgrade/.fuel-upgrade-venv/lib/python2.6/site-packages/fuel_upgrade/engines/host_system.py", line 143, in install_packages
    utils.exec_cmd('yum install -v -y {0}'.format(package))
  File "/var/upgrade/.fuel-upgrade-venv/lib/python2.6/site-packages/fuel_upgrade/utils.py", line 61, in exec_cmd
    _wait_and_check_exit_code(cmd, child)
  File "/var/upgrade/.fuel-upgrade-venv/lib/python2.6/site-packages/fuel_upgrade/utils.py", line 112, in _wait_and_check_exit_code
    'exit code: {1} '.format(exit_code, cmd))
ExecutedErrorNonZeroExitCode: Shell command executed with "1" exit code: yum install -v -y fuel-7.0.0
===

Therefore, not all commands in fuel upgrade script has stderr redirection.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/241314

[OpenStack Infra (hudson-openstack)]

Change abandoned by Ruslan Aliev (<email address hidden>) on branch: master
Review: https://review.openstack.org/241314