Changed start-onos.sh to only write a new logback.xml if there isn't an existing one. This allows users to override our default logback config. Also added a logback.xml example for long-term deployments which rolls logfiles daily and cleans up old logs
diff --git a/conf/cassandra-repair.sh b/conf/cassandra-repair.sh
new file mode 100755
index 0000000..2c2638e
--- /dev/null
+++ b/conf/cassandra-repair.sh
@@ -0,0 +1 @@
+<cassandra_dir>/bin/nodetool repair