Revert "Remove windows tests so that we can workaround a timeout running all windows tests on shippable"

This reverts commit a61fd31e2e.

Now that shippable has run once, it won't run the complete windows tests
anymore so we don't have to worry about any timeouts anymore.

shippable.yml

@@ -22,8 +22,8 @@ matrix:
 
     - env: TEST=rhel/7.4
 
-    #- env: TEST=windows/1
-    #- env: TEST=windows/2
+    - env: TEST=windows/1
+    - env: TEST=windows/2
 
     - env: TEST=network