As per logs
2015-10-21T06:59:19.857Z| vcpu-0| I120: SNAPSHOT: SnapshotCheckSpaceAndSnapshotNum: Error getting the free space on the storage disk
is the only error, rest looks good.
generally (most of the cases) after reinstalling VMtools without VSS, snapshot woks with Quiesce option.
It's tried and tested , I am using TSM-VE backup tool which use same APIs.
Regards
Pankaj Sharma