Update notes for submitted changes

* Schema-less StatsTables: Adding support for Dynamic Stats Tables - tables that are not present in viz.sandesh. Vizd stores type information in Cassandra along with each attribute. QE does not depend on schema information while processing queries on Dynamic Stats Tables. We are not able to do any validation of the select and where phrases in OpServer and QE - if the client enters an incorrect query, they will not get any error ; they will just get 0 rows in the result.