Avoid setting up DHCP firewall rules with FlatManager
Avoid setting up DHCP firewall rules with FlatManager

Fixes bug #704737

With FlatManager, ensure that the network info's dhcp_server value is not set
and use that key to decide in the compute service whether DHCP firewall rules should be added.

Change-Id: I8183a6fa3881adea1a09f3f1a29442e6b7a919ce

n0ano/gantt,n0ano/gantt