Added configuration for /etc/neutron/neutron.conf

for configuring OVS plugin we need to configure the neutron.conf file
as per the configuration of /etc/neutron/neutron.conf for installation
of neutron on controller node. for neutron installation on compute node,
only auth_uri setting is missing in the configuration of
/etc/neutron/neutron.conf that i have added.

Closes-Bug:#1246068

Change-Id: I0628f65202dacf34997ec8ea6552b5b6faddbc69
backport: havana
Merge "Added configuration for /etc/neutron/neutron.conf"