improve network configuration

This branch accomplishes several things:
 - centrally handle 'dsmode' to be 'local' or 'net.
   This allows local data sources to run before networking
   but still have user-data read by default when networking is available.

 - support networking information being read on dreamcompute
   dreamcompute's openstack declares networking via the
   /etc/network/interfaces style 'network_config' format.
 
 - support reading and applying networking information on SmartOS

 - improve reading networking from openstack network_data.json (LP: #1577982)
   add support for mtu and routes and many miscellaneous fixes.

 - support for renaming devices in a container (LP: #1579130).
   Also rename network devices as instructed by the host on
   every boot where cloud-init networking is enabled.  This is required
   because a.) containers do not get systemd.link files applied
   as they do not have udev. b.) if the initramfs is out of date
   then we need to apply them.

 - remove blocking of udev rules (LP: #1577844, LP: #1571761)

LP: #1577982, #1579130, #1577844, #1571761

1 files changed, 6 insertions, 0 deletions

diff --git a/cloudinit/distros/__init__.py b/cloudinit/distros/__init__.py
index 0f222c8c..5c29c804 100644
--- a/cloudinit/distros/__init__.py
+++ b/cloudinit/distros/__init__.py
@@ -31,6 +31,7 @@ import stat
 
 from cloudinit import importer
 from cloudinit import log as logging
+from cloudinit import net
 from cloudinit import ssh_util
 from cloudinit import type_utils
 from cloudinit import util
@@ -128,6 +129,8 @@ class Distro(object):
                                         mirror_info=arch_info)
 
     def apply_network(self, settings, bring_up=True):
+        # this applies network where 'settings' is interfaces(5) style
+        # it is obsolete compared to apply_network_config
         # Write it out
         dev_names = self._write_network(settings)
         # Now try to bring them up
@@ -143,6 +146,9 @@ class Distro(object):
             return self._bring_up_interfaces(dev_names)
         return False
 
+    def apply_network_config_names(self, netconfig):
+        net.apply_network_config_names(netconfig)
+
     @abc.abstractmethod
     def apply_locale(self, locale, out_fn=None):
         raise NotImplementedError()