Require dnspython>=1.12.0

The Designate project requires a particular bugfix included in
dnspython 1.12.0 commit 2db54ba975ed5be22f92af105bb2bd6b0ccbbef1.

This buxfix allows for correctly TSIG signing a DNS response
packet.

Change-Id: I4c66dbaf38f4771301106cb4349b64037115972a
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 "Require dnspython>=1.12.0"
Merge "Upgrade oslo.db>=1.1.0"