Remove main execution block from Quasar model and add configuration files for testing

- Eliminated the main execution block from the Quasar model for cleaner code.
- Introduced new configuration files `config_1.conf` and `config_2.conf` for Quasar devices, detailing interface settings and IP configurations.
- Added expected output JSON files `config_1.expected.json` and `config_2.expected.json` to validate the parsing of Quasar configurations against expected results.

tests/fixtures/quasar/config_2.expected.json

@@ -0,0 +1,94 @@
+{
+  "system": {
+    "model": "D5232C-T",
+    "serial_number": "WHF1C87123456A",
+    "version": "0.2.23_9.9.1_GA"
+  },
+  "interfaces": [
+    {
+      "interface": "1/1",
+      "ip_address": null,
+      "mask": null,
+      "description": "TEST_HW_1_1"
+    },
+    {
+      "interface": "1/3",
+      "ip_address": null,
+      "mask": null,
+      "description": "TEST_HW_1_3"
+    },
+    {
+      "interface": "2/1",
+      "ip_address": null,
+      "mask": null,
+      "description": "TEST_HW_2_1"
+    },
+    {
+      "interface": "2/2",
+      "ip_address": null,
+      "mask": null,
+      "description": "TEST_HW_2_2"
+    },
+    {
+      "interface": "2/3",
+      "ip_address": null,
+      "mask": null,
+      "description": "TEST_HW_2_3"
+    },
+    {
+      "interface": "2/4",
+      "ip_address": null,
+      "mask": null,
+      "description": "TEST_HW_2_4"
+    },
+    {
+      "interface": "3/1",
+      "ip_address": null,
+      "mask": null,
+      "description": "TEST_HW_3_1"
+    },
+    {
+      "interface": "3/3",
+      "ip_address": null,
+      "mask": null,
+      "description": "TEST_HW_3_3"
+    },
+    {
+      "interface": "3/4",
+      "ip_address": null,
+      "mask": null,
+      "description": "TEST_HW_3_4"
+    },
+    {
+      "interface": "4/1",
+      "ip_address": null,
+      "mask": null,
+      "description": "TEST_HW_4_1"
+    },
+    {
+      "interface": "4/2",
+      "ip_address": null,
+      "mask": null,
+      "description": "TEST_HW_4_2"
+    },
+    {
+      "interface": "4/3",
+      "ip_address": null,
+      "mask": null,
+      "description": "TEST_HW_4_3"
+    },
+    {
+      "interface": "4/4",
+      "ip_address": null,
+      "mask": null,
+      "description": "TEST_HW_4_4"
+    },
+    {
+      "interface": "ethernet",
+      "ip_address": "25.25.18.19",
+      "mask": 24,
+      "description": null
+    }
+  ],
+  "vlans": []
+}