Fixed imports in WithContainerStep.java

Author: rbutcher

src/main/java/org/jenkinsci/plugins/docker/workflow/WithContainerStep.java

@@ -50,23 +50,7 @@
 import java.util.concurrent.TimeUnit;
 import java.util.logging.Level;
 import java.util.logging.Logger;
-import javax.annotation.Nonnull;
-
-import hudson.util.VersionNumber;
-import java.util.concurrent.TimeUnit;
-import javax.annotation.CheckForNull;
-import org.jenkinsci.plugins.docker.commons.fingerprint.DockerFingerprints;
-import org.jenkinsci.plugins.docker.commons.tools.DockerTool;
-import org.jenkinsci.plugins.docker.workflow.client.WindowsDockerClient;
-import org.jenkinsci.plugins.workflow.steps.AbstractStepDescriptorImpl;
-import org.jenkinsci.plugins.workflow.steps.AbstractStepExecutionImpl;
-import org.jenkinsci.plugins.workflow.steps.AbstractStepImpl;
-import org.jenkinsci.plugins.workflow.steps.BodyExecutionCallback;
-import org.jenkinsci.plugins.workflow.steps.BodyInvoker;
-import org.jenkinsci.plugins.workflow.steps.StepContext;
-import org.jenkinsci.plugins.workflow.steps.StepContextParameter;
-import org.kohsuke.stapler.DataBoundConstructor;
-import org.kohsuke.stapler.DataBoundSetter;
+import java.util.stream.Collectors;
 
 public class WithContainerStep extends AbstractStepImpl {