Don't erase for verbose mode.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@46474 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

bootstraptest/runner.rb

@@ -163,7 +163,7 @@ End
 end
 
 def erase(e = true)
-  if e and @columns > 0
+  if e and @columns > 0 and !@verbose
     "\r#{" "*@columns}\r"
   else
     ""