testbed: Clean up old reports

Before moving new one into place to upload it to orchestrator.
Hopefully this fixes jumbled reports.

cicd/testbed_poll.pl

@@ -250,6 +250,7 @@ for ($i = 0; $i<@lines; $i++) {
       if ($ap_out =~ /Results-Dir: (.*)/g) {
          my $rslts_dir = $1;
          print ("Found results at: $rslts_dir\n");
+         do_system("rm -fr /tmp/$report_name");
          do_system("mv $rslts_dir /tmp/$report_name");
          do_system("scp -r /tmp/$report_name $report_to/");
          do_system("echo $fname > /tmp/NEW_RESULTS-$fname");