multifd: Split multifd code into its own file

Signed-off-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>

migration/Makefile.objs

@@ -7,6 +7,7 @@ common-obj-y += qemu-file-channel.o
 common-obj-y += xbzrle.o postcopy-ram.o
 common-obj-y += qjson.o
 common-obj-y += block-dirty-bitmap.o
+common-obj-y += multifd.o
 
 common-obj-$(CONFIG_RDMA) += rdma.o
 

migration/migration.c

@@ -53,6 +53,7 @@
 #include "monitor/monitor.h"
 #include "net/announce.h"
 #include "qemu/queue.h"
+#include "multifd.h"
 
 #define MAX_THROTTLE  (32 << 20)      /* Migration transfer speed throttling */