Fix issues with clirr

Author: sakthivelmanii

google-cloud-spanner/pom.xml

@@ -140,10 +140,24 @@
       <plugin>
         <groupId>org.codehaus.mojo</groupId>
         <artifactId>clirr-maven-plugin</artifactId>
-        <configuration>
-          <!-- Exclude (public) classes in this internal package -->
-          <excludes>com/google/cloud/spanner/spi/v1/**</excludes>
-        </configuration>
+        <version>2.8</version>
+        <dependencies>
+          <dependency>
+            <groupId>classworlds</groupId>
+            <artifactId>classworlds</artifactId>
+            <version>1.1</version>
+          </dependency>
+          <dependency>
+            <groupId>org.codehaus.plexus</groupId>
+            <artifactId>plexus-i18n</artifactId>
+            <version>1.0-beta-10</version>
+          </dependency>
+          <dependency>
+            <groupId>org.codehaus.plexus</groupId>
+            <artifactId>plexus-utils</artifactId>
+            <version>4.0.2</version>
+          </dependency>
+        </dependencies>
       </plugin>
     </plugins>
     <pluginManagement>