Minor changes

- Remove unneeded string conversions
- Remove resolve-retry infinite openvpn configuration (unneeded)
- Add cover on single tests and single test files for Vscode

.devcontainer/devcontainer.json

@@ -108,6 +108,8 @@
             "-v",
             // "-race"
         ],
-        "go.testTimeout": "600s"
+        "go.testTimeout": "600s",
+        "go.coverOnSingleTestFile": true,
+        "go.coverOnSingleTest": true
     }
 }