ResourceStore deleteResource by comparing timestamp may be failed to delete caused by time precision loose

In ResourceStore, the interface deleteResourceImpl(String resPath, long timestamp) maybe failed to delete the resource because the resource timestamp may lose the precision.

For example, if we use $KYLIN_HOME/bin/metastore.sh to backup from metastore to Local OS filesystem, and restore from local filesystem to metastore. The resource timestamp will lose precision in Millis Second.

An example here:
original timestamp: 1559564381
after precision lost: 1559564000

The fix design is to tolerate [0-999] ms difference when comparing the timestamp