Sync local from oslo.

local has a broken TLS symbol - strong_store - in Nova today, fixed in oslo
some time ago in Ib544be1485823f6c619312fdee5a04031f48bbb4

Change-Id: If4dd973acc23921dbc2bc69bb76225deb2802dad
Closes-Bug: #1251920
(cherry picked from commit 9b44d9d75d3767c6b7d1af4f237da8c1cf16266a)
Merge "Sync local from oslo." into stable/havana