Remove unused imports in PullRequestImportJob

Change-Id: Iedc2f4fc8e39f5dbf5b066bd94867a3c2ce08e62

github-plugin/src/main/java/com/googlesource/gerrit/plugins/github/git/PullRequestImportJob.java

diff --git a/github-plugin/src/main/java/com/googlesource/gerrit/plugins/github/git/PullRequestImportJob.java b/github-plugin/src/main/java/com/googlesource/gerrit/plugins/github/git/PullRequestImportJob.java
index 0e941af..5ec2d4d 100644
--- a/github-plugin/src/main/java/com/googlesource/gerrit/plugins/github/git/PullRequestImportJob.java
+++ b/github-plugin/src/main/java/com/googlesource/gerrit/plugins/github/git/PullRequestImportJob.java
@@ -16,7 +16,6 @@
 import java.io.IOException;
 import java.util.List;
 
-import org.apache.commons.lang.StringUtils;
 import org.eclipse.jgit.api.FetchCommand;
 import org.eclipse.jgit.api.Git;
 import org.eclipse.jgit.api.errors.GitAPIException;
@@ -48,7 +47,6 @@
 import com.google.gerrit.reviewdb.client.Project.NameKey;
 import com.google.gerrit.reviewdb.server.AccountExternalIdAccess;
 import com.google.gerrit.reviewdb.server.ReviewDb;
-import com.google.gerrit.server.StringUtil;
 import com.google.gerrit.server.account.AccountImporter;
 import com.google.gerrit.server.git.GitRepositoryManager;
 import com.google.gerrit.server.project.ProjectCache;