MAINT remove debug nslookup call

Author: ogrisel

appveyor.yml

@@ -1,5 +1,6 @@
 # AppVeyor.com is a Continuous Integration service to build and run tests under
 # Windows
+# https://ci.appveyor.com/project/sklearn-ci/scikit-learn
 
 environment:
   global:
@@ -30,9 +31,6 @@ environment:
 
 
 install:
-  # Collect info to debug rare and random download errors from Rackspace cloud store
-  - "nslookup 28daf2247a33ed269873-7b1aad3fab3cc330e1fd9d109892382a.r6.cf2.rackcdn.com"
-
   # Install Python (from the official .msi of http://python.org) and pip when
   # not already installed.
   - "powershell ./continuous_integration/appveyor/install.ps1"