add support for Apache Cassandra DB

toolset/setup/linux/installer.py

@@ -565,6 +565,8 @@ class Installer:
     rm apache-cassandra-2.0.4-bin.tar.gz
     fuser -k -TERM /ssd/log/cassandra/system.log
     sleep 5
+    rm -rf /ssd/cassandra
+    rm /ssd/log/cassandra/system.log
     cp cassandra/cassandra.yaml apache-cassandra-2.0.4/conf
     cp cassandra/log4j-server.properties apache-cassandra-2.0.4/conf
     pushd apache-cassandra-2.0.4