Upgrade oslo.db>=1.1.0

As oslo.db 1.1.0 contains fix of bug 1376211 which affects Neutron,
requirements should be updated.

Related-bug: #1376211

Change-Id: I7290a9e71aeb85898cdf97f78fb7da08e16e21d1
Merge "Upgrade oslo.db>=1.1.0"