[MSHARED-904] update test dependencies for Maven 3.1 (#57)

* update test dependencies
* commons-lang not used
* declare plexus

pom.xml

@@ -90,12 +90,6 @@
       <artifactId>commons-io</artifactId>
       <version>2.6</version>
     </dependency>
-    <dependency>
-      <groupId>org.apache.commons</groupId>
-      <artifactId>commons-lang3</artifactId>
-      <version>3.8.1</version>
-      <scope>test</scope>
-    </dependency>
     <dependency>
       <groupId>org.apache.commons</groupId>
       <artifactId>commons-text</artifactId>
@@ -120,13 +114,19 @@
     <dependency>
       <groupId>org.codehaus.plexus</groupId>
       <artifactId>plexus-container-default</artifactId>
-      <version>1.7.1</version>
+      <version>2.1.0</version>
+      <scope>provided</scope>
+    </dependency>
+    <dependency>
+      <groupId>org.codehaus.plexus</groupId>
+      <artifactId>plexus-utils</artifactId>
+      <version>3.0.10</version>
       <scope>provided</scope>
     </dependency>
     <dependency>
       <groupId>org.apache.maven.plugin-testing</groupId>
       <artifactId>maven-plugin-testing-harness</artifactId>
-      <version>2.1</version>
+      <version>3.1.0</version>
       <scope>test</scope>
     </dependency>
   </dependencies>