[td-225] update the api in query process functions. remove the tsrpcheadsize in msg to vnode.refactor some codes.

[td-225] add cancel query support, fix bugs in load file blocks when column has already been updated.

td-449: more cases passedcurrently, only below four cases fail:* agg_stream.sim ('us' ?)* column_stream.sim ('us' ?)* table_replica1_vnoden.sim (crash)* new_stream.sim (failed at line 101)