* storagenode/nodestats: fix issue on 32 bit platforms
time.Duration is an int64, so casting it down to an int
can cause it to become negative, causing a panic.
Change-Id: I33da7c29ddd59be60d8deec944a25f4a025902c7
* storagenode/nodestats: fix lint issue in test
Change-Id: Ie68598d724d2cae0dc959d4877098a08f4eb9af7
