test: add more settings to test-benchmark-dgram

Add settings to test-benchmark-dgram such that it only runs benchmark per benchmark file.

Author: Trott

test/parallel/test-benchmark-dgram.js

@@ -4,4 +4,10 @@ require('../common');
 
 construnBenchmark=require('../common/benchmark');
 
-runBenchmark('dgram',['dur=0.1','chunks=2']);
+runBenchmark('dgram',['address=true',
+'chunks=2',
+'dur=0.1',
+'len=1',
+'n=1',
+'num=1',
+'type=send']);