Move OpenVPNAdapter tests to their own subfolder

Tests/OpenVPNAdapter/CustomFlow.swift

@@ -0,0 +1,21 @@
+//
+//  CustomFlow.swift
+//  OpenVPN Adapter
+//
+//  Created by Sergey Abramchuk on 28.10.2017.
+//
+
+import NetworkExtension
+@testable import OpenVPNAdapter
+
+class CustomFlow: NSObject, OpenVPNAdapterPacketFlow {
+    
+    func readPackets(completionHandler: @escaping ([Data], [NSNumber]) -> Void) {
+        
+    }
+    
+    func writePackets(_ packets: [Data], withProtocols protocols: [NSNumber]) -> Bool {
+        return true
+    }
+    
+}