Updated openstack/openstack
Project: openstack-dev/devstack  307cfcb9d11945b5f89f249d8779e51c87f1bc34

neutron: set connection string in neutron.conf

it's not recommended to put the connection string in plugin specific
config file [1].

[1]:
https://github.com/openstack/neutron/blob/master/etc/neutron.conf#L534

Change-Id: I3c9d7fe3d34385185f483b509dadf7e2ba920a45