[FIXED HUDSON-1816] In 1.321. Applied a patch from Yury Bubnov.

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@20679 71c3de6d-444a-0410-be80-ed276b4c234a

core/src/main/java/hudson/scm/CVSSCM.java

@@ -864,7 +864,7 @@ public class CVSSCM extends SCM implements Serializable {
                     task.setFailOnError(true);
                     BufferedOutputStream bufferedOutput = new BufferedOutputStream(out);
                     task.setDeststream(bufferedOutput);
-                    task.setBranch(branch);
+                    task.setTag(isTag() ? ":" + branch : branch);
                     task.setStart(startTime);
                     task.setEnd(endTime);
                     if(changedFiles!=null) {