Windows: Adds HCS Calls and Bug Fixes

Move the windows plugin to use the Host Compute (v2) APIs, as well
as clean-up the code. Allows win-bridge to use either the old API or Host Compute (v2) api
depending on a conf parameter. Fixes a leaked endpoint issue on windows for the v1 flow, and
removes the hns/pkg from the linux test run.

Godeps/Godeps.json

@@ -13,8 +13,8 @@
 		},
 		{
 			"ImportPath": "github.com/Microsoft/hcsshim",
-			"Comment": "v0.7.4",
-			"Rev": "e44e499d29527b244d6858772f1b9090eeaddc4e"
+			"Comment": "v0.7.6",
+			"Rev": "6efef912cc0ecd8778bab95d105662d4f73f8ccd"
 		},
 		{
 			"ImportPath": "github.com/Microsoft/hcsshim/internal/guid",