Bump Cassandra Version to 2.1.0

the latest cassandra package has been updated
from 2.0.6 to 2.1.0. bug #1376951 addresses
the necessary trove changes.

Change-Id: If51a9b4e6c5f8913592ffc9f4aa64bb5fb4f8345
Closes-Bug: #1378116
Merge "Bump Cassandra Version to 2.1.0"