Upgrade testng 6.11

Author: slandelle

pom.xml

@@ -389,7 +389,7 @@
 		<rxjava.version>1.3.0</rxjava.version>
 		<rxjava2.version>2.1.3</rxjava2.version>
 		<logback.version>1.2.3</logback.version>
-		<testng.version>6.9.10</testng.version>
+		<testng.version>6.11</testng.version>
 		<jetty.version>9.4.6.v20170531</jetty.version>
 		<tomcat.version>8.5.14</tomcat.version>
 		<commons-io.version>2.4</commons-io.version>