Prevent reloading of logback.xml from UDF sandbox

cqlsh:mykeyspace> CREATE OR REPLACE FUNCTION sdState ( state tuple<int,double,double>, val double ) CALLED ON NULL INPUT RETURNS tuple<int,double,double> LANGUAGE java AS 
 ... 'int n = state.getInt(0); double mean = state.getDouble(1); double m2 = state.getDouble(2); n++; double delta = val - mean; mean += delta / n; m2 += delta * (val - mean); state.setInt(0, n); state.setDouble(1, mean); state.setDouble(2, m2); return state;'; 

cqlsh:mykeyspace> CREATE OR REPLACE FUNCTION sdFinal ( state tuple<int,double,double> ) CALLED ON NULL INPUT RETURNS double LANGUAGE java AS 
 ... 'int n = state.getInt(0); double m2 = state.getDouble(2); if (n < 1) { return null; } return Math.sqrt(m2 / (n - 1));';

cqlsh:mykeyspace> CREATE AGGREGATE IF NOT EXISTS stdev ( double ) 
 ... SFUNC sdState STYPE tuple<int,double,double> FINALFUNC sdFinal INITCOND (0,0,0);

CREATE TABLE readings (
    sensor_id int,
    time timestamp,
    temperature double,
    status text,
    PRIMARY KEY (sensor_id, time)
) WITH CLUSTERING ORDER BY (time ASC);

cqlsh:mykeyspace> select * from readings limit 10;

 sensor_id | time                            | status | temperature
-----------+---------------------------------+--------+-------------
         5 | 2016-08-24 19:11:34.896000+0000 |     OK |        9.97
         5 | 2016-08-24 19:11:43.933000+0000 |     OK |       10.28
         5 | 2016-08-24 19:11:49.958000+0000 |     OK |        7.65
         5 | 2016-08-24 19:11:51.968000+0000 |     OK |       10.11
         5 | 2016-08-24 19:12:58.512000+0000 |  Fault |       10.41
         5 | 2016-08-24 19:13:04.542000+0000 |     OK |        9.66
         5 | 2016-08-24 19:13:16.593000+0000 |     OK |        10.9
         5 | 2016-08-24 19:13:37.692000+0000 |     OK |        11.2
         5 | 2016-08-24 19:13:46.738000+0000 |     OK |       10.34
         5 | 2016-08-24 19:13:49.757000+0000 |     OK |        10.6

select avg(temperature), stdev(temperature) from readings where sensor_id = 1 and time > 1472066523193;

cqlsh:mykeyspace> select avg(temperature), stdev(temperature) from readings where sensor_id = 1 and time > 1472066523193;

 system.avg(temperature) | mykeyspace.stdev(temperature)
-------------------------+-------------------------------
                  9.9291 |                       0.94179

(1 rows)

cqlsh:mykeyspace> select avg(temperature), stdev(temperature) from readings where sensor_id = 1 and time > 1472066523193;
Traceback (most recent call last):
  File "/usr/local/Cellar/cassandra/3.7/libexec/bin/cqlsh.py", line 1277, in perform_simple_statement
    result = future.result()
  File "cassandra/cluster.py", line 3629, in cassandra.cluster.ResponseFuture.result (cassandra/cluster.c:69369)
    raise self._final_exception
FunctionFailure: Error from server: code=1400 [User Defined Function failure] message="execution of 'mykeyspace.sdstate[frozen<tuple<int, double, double>>, double]' failed: java.security.AccessControlException: access denied ("java.io.FilePermission" "/usr/local/etc/cassandra/logback.xml" "read")"

cqlsh:mykeyspace> select count(*), avg(temperature), stdev(temperature) from readings where sensor_id = 1 and time > '2016-08-24 15:00:00.000+0000';
Traceback (most recent call last):
  File "/usr/local/Cellar/cassandra/3.7/libexec/bin/cqlsh.py", line 1277, in perform_simple_statement
    result = future.result()
  File "cassandra/cluster.py", line 3629, in cassandra.cluster.ResponseFuture.result (cassandra/cluster.c:69369)
    raise self._final_exception
FunctionFailure: Error from server: code=1400 [User Defined Function failure] message="execution of 'mykeyspace.sdstate[frozen<tuple<int, double, double>>, double]' failed: com.datastax.driver.core.exceptions.CodecNotFoundException"