providers/virtualbox: import progress works on Windows

CHANGELOG.md

@@ -22,6 +22,7 @@ BUG FIXES:
   - hosts/linux: Unusual sed delimiter to avoid conflicts. [GH-3167]
   - providers/virtualbox: Make more internal interactions with VBoxManage
     retryable to avoid spurious VirtualBox errors. [GH-2831]
+  - providers/virtualbox: Import progress works again on Windows.
   - provisioners/ansible: Request SSH info within the provision method,
     when we know its available. [GH-3111]
   - synced\_folders/rsync: owner/group settings work. [GH-3163]

plugins/providers/virtualbox/driver/version_4_3.rb

@@ -203,7 +203,7 @@ module VagrantPlugins
               output << data
             elsif type == :stderr
               # Append the data so we can see the full view
-              total << data
+              total << data.gsub("\r", "")
 
               # Break up the lines. We can't get the progress until we see an "OK"
               lines = total.split("\n")