Update git submodules
* Update tempest-stress from branch 'master'
to 1a69a2625b242639498b49ef9168f2b16af01fa7
- Merge "Use py3 as the default runtime for tox"
- Use py3 as the default runtime for tox
Moving on py3 as the default runtime for tox to avoid to update
this at each new cycle.
Change-Id: I5da71f4ab24f9a7ca889044d03e801ff41c7fe18
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