Update VerticaConfiguration.java

Added JDBC debug logging options. Will be useful to get more information when a load fails from JDBC driver logs.  Setting it to 

0 (off) log nothing 
1 (error) logs only errors 
2 (warning) logs warnings 
3 (info) logs general information, the queries that run and the protocol 
messages between client& server 
4 (debug) logs most, but not all, function entrances 
5 (trace) is probably overkill. There isn't actually any additional 
information logged, but with trace enabled, the SDK prints a whole stack 
trace with every log message

Here is an example call:

sudo hadoop jar hadoop-vertica-example.jar com.vertica.hadoop.VerticaExample 
-libjars /usr/lib/hadoop/lib/hadoop-vertica.jar,/usr/lib/hadoop/lib/vertica-jdk5.jar 
-Dmapred.vertica.hostnames=host1,host2,host3,host4  -Dmapred.vertica.port=5435 
-Dmapred.vertica.username=hdfs  -Dmapred.vertica.database=HADOOP 
-Dmapred.vertica.debug=1