v3.0.0-rc.3: vlog.go: Fix wrongly maintain the offset of file in memory (#640)

When the write file but may successfully write some part of data
but we don's added the offset that we maintain, later successfully
write request will get a wrong offset.

Add a test when no disk space fail to write and should recover after disk space are free up
set file size resource limit to make it write fail like no disk space