Convert v2v download time cost result to int
Convert v2v download time cost result to int

Resolves http://jira.zstack.io/browse/ZSTAC-18039

Signed-off-by: AlanJager <7ba0221af525cfcc7adbf94f7fc6b46fa1dcb7c9@outlook.com>

zstackorg/zstack-utility,zstackio/zstack-utility,zstackorg/zstack-utility,zstackorg/zstack-utility,zstackio/zstack-utility,zstackio/zstack-utility