Removed unused import

Author: jonsten

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

@@ -49,7 +49,6 @@
 import java.util.Map;
 import java.util.Set;
 import java.util.TreeSet;
-import org.jenkinsci.plugins.docker.commons.fingerprint.DockerFingerprints;
 import org.jenkinsci.plugins.docker.commons.tools.DockerTool;
 import org.jenkinsci.plugins.docker.workflow.client.DockerClient;
 import org.jenkinsci.plugins.docker.workflow.client.WindowsDockerClient;