iostatus: move BlockdevOnError declaration to QAPI

This will let block-stream reuse the enum.  Places that used the enums
are renamed accordingly.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
diff --git a/block.c b/block.c
index 7b45082..1c3ebd7 100644
--- a/block.c
+++ b/block.c
@@ -4209,9 +4209,9 @@
 bool bdrv_iostatus_is_enabled(const BlockDriverState *bs)
 {
     return (bs->iostatus_enabled &&
-           (bs->on_write_error == BLOCK_ERR_STOP_ENOSPC ||
-            bs->on_write_error == BLOCK_ERR_STOP_ANY    ||
-            bs->on_read_error == BLOCK_ERR_STOP_ANY));
+           (bs->on_write_error == BLOCKDEV_ON_ERROR_ENOSPC ||
+            bs->on_write_error == BLOCKDEV_ON_ERROR_STOP   ||
+            bs->on_read_error == BLOCKDEV_ON_ERROR_STOP));
 }
 
 void bdrv_iostatus_disable(BlockDriverState *bs)