NetworkManager is quite capable to do automatic
interface configuration. NetworkManager will by default
try to auto-configure any interface with no configuration.
It will use DHCP for IPv4 and Router Advertisements to
decide how to initialize IPv6.
It will most likely do it just as good, or better than the
dhcp-all-interfaces.sh script.
Since dhcp-all-interfaces clean out all ifcfg files in
60-remove-cloud-image-interfaces it means NetworkManager will
by default attempt auto configuration for all interfaces.
This change add's and environment variable:
DIB_DHCP_NETWORK_MANAGER_AUTO (default: false)
When DIB_DHCP_NETWORK_MANAGER_AUTO is set to `true` only the
NetworkManager config will be written. The dhcp-all-interfaces
service will not be installed. Hence dhcp-all-interfaces will
not write any config files, allowing NetworkManager to just do
it's thing.
Change-Id: Id6f8d6aaaf52a78175bb6c065ec88274c364834e
