Update case31
Remove .pyc and log files
Add script to clean up cassandra db
Refactor ONOS Drivers
Changes include:
        Include component handle in log messages
        Replace carriage returns with new line characters
        Remove static IP addresses and passwords
        Add exception handling to prevent TestON crashes
        Delete old tests and duplicate files

Onoscli driver
        Remove assert from isup()
        Parameterize REST port and set default to 8080
        Add ONOS home directory, default to ~/ONOS
        Merge onosrestapidriver.py into onosclidriver.py
        Remove ctrl_one and ctrl_none functions
        Improve git_pull() error checking
        Parameterize the interface for tcpdump
        Print more information in get_version
        Parameterize the scp source username and password for add_flow
        Remove Link_up and Link_down - see link() in mininet driver

Mininet Driver
        assign_sw_controller takes COUNT to indicate how many controllers to assign to a switch - requires change to each test that uses this function to assign more than 1 controller to a switch
        remove static password
        doubled timeout for cleanup(larger networks can take longer to clean)

Zookeeper Driver
        Remove start() call from connect()
        add Zookeeper home directory, with default as ~/zookeeper-3.4.5

Cassandra Driver
        Improve logic of status function
        Check if self is up in isup instead of 4 instances running
Working copy of RAMCloud changes
Working copy of RAMCloud changes
add ONOS home variable to RAMCloud driver