vagrant: use https pypi url for wheezy

http url stopped working

Vagrantfile

@@ -31,7 +31,7 @@ def packages_debianoid(user)
     # this way it works on older dists (like ubuntu 12.04) also:
     # for python 3.2 on ubuntu 12.04 we need pip<8 and virtualenv<14 as
     # newer versions are not compatible with py 3.2 any more.
-    easy_install3 'pip<8.0'
+    easy_install3 -i https://pypi.python.org/simple/ 'pip<8.0'
     pip3 install 'virtualenv<14.0'
   EOF
 end