Add network interface to base driver class

This change also introduces two network interfaces:

* flat: Copies current neutron DHCP provider logic to work with
  cleaning ports;
* noop: noop interface.

The default value of the network_interface is None, meaning that the
node will be using the default network interface. The default network
interface is determined the following way:

* if [DEFAULT]default_network_interface configuration option is set
  (the default for it is None), the specified interface becomes the
  default for all nodes;

* if it is not set, 'flat' interface will be used if the deployment
  currently uses 'neutron' DHCP provider, otherwise 'noop' interface
  will be used.

create_cleaning_ports and delete_cleaning_ports methods of the DHCP
providers are still being called in case of out-of-tree DHCP
providers, but this possibility will be removed completely in the
next release. If the DHCP provider logic is rewritten into a custom
network interface, please remove those methods from the provider, so
that network interface is called instead.

Partial-bug: #1526403
Co-Authored-By: Om Kumar <om.kumar@hp.com>
Co-Authored-By: Vasyl Saienko <vsaienko@mirantis.com>
Co-Authored-By: Sivaramakrishna Garimella <sivaramakrishna.garimella@hp.com>
Co-Authored-By: Vladyslav Drok <vdrok@mirantis.com>
Co-Authored-By: Zhenguo Niu <Niu.ZGlinux@gmail.com>
Change-Id: I0c26582b6b6e9d32650ff3e2b9a3269c3c2d5454

1 files changed, 4 insertions, 0 deletions

diff --git a/setup.cfg b/setup.cfg
index d7e5196aa..4d1f319fd 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -87,6 +87,10 @@ ironic.drivers =
     pxe_iscsi_cimc = ironic.drivers.pxe:PXEAndCIMCDriver
     pxe_agent_cimc = ironic.drivers.agent:AgentAndCIMCDriver
 
+ironic.hardware.interfaces.network =
+    flat = ironic.drivers.modules.network.flat:FlatNetwork
+    noop = ironic.drivers.modules.network.noop:NoopNetwork
+
 ironic.database.migration_backend =
     sqlalchemy = ironic.db.sqlalchemy.migration