Fix small bugs

1) Query with select_type=COUNT  was fixed
2) data-load utils was optimized
3) cassandra execute query retry if connection closed implemented
4) index system fields order was fixed

Change-Id: If6635110d6e0a814325526f696b06beb9145727c
PoC Bulk data load over network

Implemented server and client for data uploading
via streaming HTTP POST request

Partially implements: bulk-data-load-over-network

Change-Id: I97d76ed9dd81991eae2e63fe436e1797b34d7100