Use /data as test data path

Former-commit-id: 32898c42

test_jobs/aoflagger.json

@@ -2,11 +2,11 @@
    "msin": [
    {
             "class": "Directory",
-            "path": "../test_data/L570745_SB000_uv_first10.MS"
+            "path": "/data/L570745_SB000_uv_first10.MS"
    },
    {
            "class": "Directory",
-           "path": "../test_data/L570745_SB001_uv_first10.MS"
+           "path": "/data/L570745_SB001_uv_first10.MS"
    }
    ]
 }