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>

Makefile

@@ -88,6 +88,7 @@ block-obj-y +=  $(addprefix block/, $(block-nested-y))
 
 net-obj-y = net.o
 net-nested-y = queue.o checksum.o
+net-nested-$(CONFIG_POSIX) += tap.o
 net-nested-$(CONFIG_WIN32) += tap-win32.o
 net-obj-y += $(addprefix net/, $(net-nested-y))
 

net.h

@@ -174,4 +174,6 @@ void net_host_device_remove(Monitor *mon, const QDict *qdict);
 
 void qdev_set_nic_properties(DeviceState *dev, NICInfo *nd);
 
+int net_handle_fd_param(Monitor *mon, const char *param);
+
 #endif