Preserve network order when using ConfigDrive

Pass network_info to be used by InstanceMetadata instead of fetching
it by API and losing originally requested network order. This is
similar to what has been done for "content" where the original data
is lost after the initial call.

This issue only affects the ConfigDrive code path as the original
network_info is used when using file injection.

HyperV and XenApi are still probably affected by the bug but
unaffected by this fix. The fix is the same for these drivers. Simply
pass a network_info and it will be used instead of fetching the
network info by API.

Change-Id: Ie673b725cb47bf491009db99f6cb1258d46b0a69
Fixes: bug #1156844
Port extended-availability-zone API into v3 part1

This changeset only copies the v2 files into the appropriate v3
directories unchanged. The copy as-is will not be loaded by either
the v2 or v3 extension loaders. The second changeset will then
make the changes required for it to work as a v3 extension.

This is being tried in order to make reviewing of extension
porting easier as gerrit will display only what is actually
changed for v3 rather than entirely new files.

Partially implements: bp v3-api-extension-versioning

Change-Id: I531a2d2f68a268d44eaef3a5af0a9c799787b188
Merge "Port extended-availability-zone API into v3 part1"
Merge "Preserve network order when using ConfigDrive"