Add a new openstack-specs repo under the control of the TC

One of the takeaways from the exercise about kilo priorities was oslo is
not the right home for all cross project discussions. We need a new home
for cross project specs, and since the TC is our governing technical
committee this repo should be under their management.

Change-Id: Id9393dfc2c7f1f883a5f20d85f7ecb79e2c52063
Merge "Add a new openstack-specs repo under the control of the TC"