"Get-me-a-network" feature is supported in Nova API 2.37 or later.
To support this in horizon, a dummy "auto_allocated_network" is shown
in the launch instance form. I believe this approach fits the current
way of the launch instance form. The dummy network is a special network ID
and if specified the nova API wrapper converts 'nics' parameter properly.
In addition, a dummy "auto_allocated_network" is now shown in the network
table. This is because Neutron creates an actual auto allocated network
once a server is created specifying nics=="auto".
I believe this fake behavior brings consistency in the network table
to some extent, while this is just a compromise.
Note that this patch does not cover the network topology integration.
"auto_allocated_network" is not shown until the actual auto allocated
network is created. The network topology integration requires more work.
For example, the link for the fake auto allocated network should be
disabled in the flat view. The pop-up for the fake auto allocated network
should be disabled in the graph view.
Change-Id: I062fc1b7ed75dc771ddc7f13c8324ed4ffab6808
Closes-Bug: #1690433
d16ed45e06