net: use Netdev instead of NetClientOptions in client init

net: use Netdev instead of NetClientOptions in client init

This way we no longer need NetClientOptions and can convert Netdev
into a flat union.

Signed-off-by: Kővágó, Zoltán <[email protected]>
Reviewed-by: Eric Blake <[email protected]>
Message-Id: <93ffdfed7054529635e6acb935150d95dc173a12.1441627176[email protected]>

[rework net_client_init1() to pass Netdev by copying from NetdevLegacy,
rather than merging the two types - which means that we still need
NetClientOptions after all.  Rebase to qapi changes. The bulk of the
patch is mechanical, replacing 'opts' by 'netdev->opts', while
net_client_init1() takes care of converting between legacy and modern
types.]

Signed-off-by: Eric Blake <[email protected]>
Message-Id: <1468468228[email protected]>
Reviewed-by: Markus Armbruster <[email protected]>
Signed-off-by: Markus Armbruster <[email protected]>