TestNG is managed in hawkular-parent

(cherry picked from commit 7c6983b)

Signed-off-by: Stefan Negrea <snegrea@redhat.com>

pom.xml

@@ -108,7 +108,6 @@
     <version.org.jboss.logging>3.3.0.Final</version.org.jboss.logging>
     <version.org.jboss.logging.jboss-logging-tools>2.0.1.Final</version.org.jboss.logging.jboss-logging-tools>
     <version.org.slf4j>1.7.7</version.org.slf4j>
-    <version.org.testng>6.8.8</version.org.testng>
     <version.io.reactivex.rxjava>1.0.13</version.io.reactivex.rxjava>
     <version.io.reactivex.rxjava-math>1.0.0</version.io.reactivex.rxjava-math>
     <version.io.reactivex.rxjava-guava>1.0.3</version.io.reactivex.rxjava-guava>
@@ -224,15 +223,6 @@
         <artifactId>metrics-core</artifactId>
         <version>${version.com.codahale.metrics}</version>
       </dependency>
-      <!-- Tests dependencies -->
-      <!-- TestNG is not Hawkular default testing tool -->
-      <!-- While needed to run legacy tests, new tests should be based upon jUnit -->
-      <!-- It can still be used when there's a good reason (compatibility with a testing framework for example) -->
-      <dependency>
-        <groupId>org.testng</groupId>
-        <artifactId>testng</artifactId>
-        <version>${version.org.testng}</version>
-      </dependency>
       <!-- Doc dependencies -->
       <dependency>
         <groupId>io.swagger</groupId>