Remove dependency on StringUtils

Author: acocuzzo

samples/snippets/pom.xml

@@ -85,11 +85,6 @@
       <version>1.1.3</version>
       <scope>test</scope>
     </dependency>
-    <dependency>
-     <groupId>org.apache.commons</groupId>
-     <artifactId>commons-lang3</artifactId>
-     <version>3.12</version>
-    </dependency>
   </dependencies>
 
 </project>

samples/snippets/src/test/java/pubsublite/spark/SampleTestBase.java

@@ -42,8 +42,8 @@
 import java.util.Arrays;
 import java.util.Map;
 import java.util.Optional;
+import java.util.String;
 import java.util.UUID;
-import org.apache.commons.lang3.StringUtils;
 import org.apache.maven.shared.invoker.DefaultInvocationRequest;
 import org.apache.maven.shared.invoker.DefaultInvoker;
 import org.apache.maven.shared.invoker.InvocationOutputHandler;
@@ -110,7 +110,7 @@ protected void findMavenHome() throws Exception {
     assertThat(p.waitFor()).isEqualTo(0);
     String s;
     while ((s = stdOut.readLine()) != null) {
-      if (StringUtils.startsWith(s, "Maven home: ")) {
+      if (String.startsWith(s, "Maven home: ")) {
         mavenHome = s.replace("Maven home: ", "");
       }
     }