Change netty logs to INFO when running tests (#3196)

netty is really quite noisy at debug level making it hard to read the
output of yaml tests

Author: ScottDugas

gradle/scripts/log4j-test.properties

@@ -29,3 +29,8 @@ appender.console.layout.pattern = %d [%level] %logger{1.} - %m %X%n%ex{full}
 rootLogger.level = debug
 rootLogger.appenderRefs = stdout
 rootLogger.appenderRef.stdout.ref = STDOUT
+
+logger.netty-grpc.name = io.grpc.netty
+logger.netty-grpc.level = INFO
+logger.netty.name = io.netty
+logger.netty.level = INFO