Fixing package name in template conf

conf/metrics.properties.template

@@ -82,10 +82,10 @@
 
 ## Examples
 # Enable JmxSink for all instances by class name
-#*.sink.jmx.class=spark.metrics.sink.JmxSink
+#*.sink.jmx.class=org.apache.spark.metrics.sink.JmxSink
 
 # Enable ConsoleSink for all instances by class name
-#*.sink.console.class=spark.metrics.sink.ConsoleSink
+#*.sink.console.class=org.apache.spark.metrics.sink.ConsoleSink
 
 # Polling period for ConsoleSink
 #*.sink.console.period=10
@@ -98,7 +98,7 @@
 #master.sink.console.unit=seconds
 
 # Enable CsvSink for all instances
-#*.sink.csv.class=spark.metrics.sink.CsvSink
+#*.sink.csv.class=org.apache.spark.metrics.sink.CsvSink
 
 # Polling period for CsvSink
 #*.sink.csv.period=1
@@ -114,11 +114,11 @@
 #worker.sink.csv.unit=minutes
 
 # Enable jvm source for instance master, worker, driver and executor
-#master.source.jvm.class=spark.metrics.source.JvmSource
+#master.source.jvm.class=org.apache.spark.metrics.source.JvmSource
 
-#worker.source.jvm.class=spark.metrics.source.JvmSource
+#worker.source.jvm.class=org.apache.spark.metrics.source.JvmSource
 
-#driver.source.jvm.class=spark.metrics.source.JvmSource
+#driver.source.jvm.class=org.apache.spark.metrics.source.JvmSource
 
-#executor.source.jvm.class=spark.metrics.source.JvmSource
+#executor.source.jvm.class=org.apache.spark.metrics.source.JvmSource