Numan Siddique b2b8cf72a8 ovn: Add dns_servers configuration support
networking-ovn optionally expects list of dns server to be defined in the
config -'ovn/dns_servers'. These will be included in the 'dns_server' DHCP
option field when the VMs send DHCP request if the subnet's dns_nameservers field
is not defined by the user.

Change-Id: I353ac905069ecc945720df2b9e3051989238a02a
Partial-bug: #1774052
2018-06-03 13:17:19 +05:30
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