Removing test from windows

Tests/EndToEndTests/Image/AlexNet/testcases.yml

@@ -1,9 +1,9 @@
 dataDir: ../Data
 tags:
      # running on every BVT job in 'I' (Image) leg:
-     - bvt-i  (build_sku == 'gpu') and (device=='gpu') and (flavor=='release')
+     - bvt-i  (build_sku == 'gpu') and (device=='gpu') and (flavor=='release') and (os=='linux')
      # running every Nightly job in 'I' leg
-     - nightly-i (build_sku == 'gpu') and (device=='gpu') and (flavor=='release')
+     - nightly-i (build_sku == 'gpu') and (device=='gpu') and (flavor=='release') and (os=='linux')
 
 testCases:
   CNTK Run must be completed: