Remove 'set -x' from run_tests.sh
Remove 'set -x' from run_tests.sh

Removed because it makes --help hard to read.
Also it's hard to figure out what happened and
where was the error.

Change-Id: I46c3f39ff637e315f5f179981de17acefdfc6cf1
Implements: blueprint cinder-neutron-plugins-in-fuel

stackforge/fuel-plugins,nebril/fuel-plugins,stackforge/fuel-plugins,nebril/fuel-plugins