Updated openstack/openstack
Project: openstack/tempest  14f0a26087f16441f4fcbf946eff073f0a949a40
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Add additional documentation for stress tests

In order to encourage people to add more and more stress tests we
need more documentation about it. This documents the stresstest
decorator and gives a global overview.

Change-Id: I65294fb278faba7a0d324782bf50e2fdedc5c1de