Do not overwrite nosetests exit code with tee
Do not overwrite nosetests exit code with tee

When output of nosetests is piped to tee, tee's exit status overwrites
that of nosetests, and the pipeline returns 0 even on failures and
errors.

This reverts part of the changes done in:
440aded2f5025a8117bf87f74de8c24ef79f68a5

Change-Id: Ia7fc2ab5719c878c740d9167d31cdaa018404c3c
Closes-bug: #1300483
Signed-off-by: Dmitry Borodaenko <212b0b90d5bd90ae3924912ac708c442ffd3e040@mirantis.com>

nebril/fuel-web,koder-ua/nailgun-fcert,SmartInfrastructures/fuel-web-dev,eayunstack/fuel-web,koder-ua/nailgun-fcert,SmartInfrastructures/fuel-web-dev,nebril/fuel-web,huntxu/fuel-web,zhaochao/fuel-web,SmartInfrastructures/fuel-web-dev,stackforge/fuel-web,prmtl/fuel-web,huntxu/fuel-web,eayunstack/fuel-web,huntxu/fuel-web,eayunstack/fuel-web,koder-ua/nailgun-fcert,zhaochao/fuel-web,SmartInfrastructures/fuel-web-dev,nebril/fuel-web,SmartInfrastructures/fuel-web-dev,stackforge/fuel-web,nebril/fuel-web,eayunstack/fuel-web,stackforge/fuel-web,zhaochao/fuel-web,nebril/fuel-web,prmtl/fuel-web,huntxu/fuel-web,huntxu/fuel-web,koder-ua/nailgun-fcert,prmtl/fuel-web,prmtl/fuel-web,zhaochao/fuel-web,eayunstack/fuel-web,prmtl/fuel-web,zhaochao/fuel-web