Mark network ui endpoints unix-only

Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>

api/server/server_experimental.go → api/server/server_experimental_unix.go

@@ -1,4 +1,4 @@
-// +build experimental
+// +build experimental,!windows
 
 package server
 

api/server/server_stub.go

@@ -1,4 +1,4 @@
-// +build !experimental
+// +build !experimental windows
 
 package server