SCMSourceRetrieverTest.java: cleanup imports

Author: jimklimov

src/test/java/org/jenkinsci/plugins/workflow/libs/SCMSourceRetrieverTest.java

@@ -42,15 +42,14 @@
 import hudson.model.TaskListener;
 import hudson.plugins.git.GitSCM;
 import hudson.plugins.git.BranchSpec;
-import hudson.remoting.VirtualChannel;
 import hudson.scm.ChangeLogSet;
 import hudson.scm.SCM;
 import hudson.slaves.EnvironmentVariablesNodeProperty;
 import hudson.slaves.NodeProperty;
 import hudson.slaves.NodePropertyDescriptor;
 import hudson.slaves.OfflineCause;
 import hudson.slaves.WorkspaceList;
-import hudson.slaves.WorkspaceList;
+
 import java.io.File;
 import java.io.IOException;
 import java.lang.reflect.Field;
@@ -66,7 +65,6 @@
 import jenkins.branch.BranchProperty;
 import jenkins.branch.BranchSource;
 import jenkins.branch.DefaultBranchPropertyStrategy;
-import jenkins.model.Jenkins;
 import jenkins.plugins.git.GitSCMSource;
 import jenkins.plugins.git.GitSampleRepoRule;
 import jenkins.scm.api.SCMHead;