Update git submodules
* Update freezer-specs from branch 'master'
- Merge "Add placeholder for Train specs"
- Add placeholder for Train specs
The "T" release of OpenStack is officially "Train".
http://lists.openstack.org/pipermail/openstack-dev/2018-November/136464.html
Change-Id: Ib6dec138ff7b0b3c2b3aa1abc8de7c00b0517505
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