FEATURE: PCI-2069 Remove dnsmasq strict-order option

Removing strict-order from dnsmasq's command line allows to set multiple nameservers in compute node's /etc/resolv.conf in HA manner.

Option strict-order can be set back in /etc/nova/dnsmasq-nova.conf any time (kill dnsmasq && restart nova-network required).

Please see https://jira.intgdc.com/browse/PCI-2069 for details