Make cassandra.yaml compatible with 1.2

Rename:

authorizer -> authority

Comment-out the following entries:

hinted_handoff_throttle_in_kb
max_hints_delivery_threads
permissions_validity_in_ms
disk_failure_policy
start_native_transport
native_transport_port
start_rpc
rpc_address
read_request_timeout_in_ms
range_request_timeout_in_ms
write_request_timeout_in_ms
truncate_request_timeout_in_ms
request_timeout_in_ms