net: split all the tap code out into net/tap.c

Signed-off-by: Mark McLoughlin <markmc@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
diff --git a/net.h b/net.h
index 29ed67f..338d84a 100644
--- a/net.h
+++ b/net.h
@@ -174,4 +174,6 @@
 
 void qdev_set_nic_properties(DeviceState *dev, NICInfo *nd);
 
+int net_handle_fd_param(Monitor *mon, const char *param);
+
 #endif