the src-neutron-icehouse jobs should only run smoke tests

The neutron icehouse jobs did not get to the point where they could
actually reliably run the tempest full test suite. For the src jobs,
admit that, and use smoke only if we are testing stable/icehouse.

Change-Id: I76f28407d3599c64de646da99097a1860cb1e510
Merge "the src-neutron-icehouse jobs should only run smoke tests"