Upgrade cassandra version to 2.0.8

Also Cassandra driver is updated to 2.0.1

Change-Id: I695720e451f5bccbf2833c364a68fb6e8398d0ea
Bulk data load

Implemented server for data uploading
via streaming HTTP POST request

Implements blueprint: ingest-from-big-data-analytics

Change-Id: I6b92110c5751986705ce116d979b3064407994ee