prefer pip packages over distro packages to fix runtime_version ImportError

Signed-off-by: Yijing Yan <yijingyan@microsoft.com>

Author: yijingyan2

sonic-ycabled/tests/conftest.py

@@ -0,0 +1,31 @@
+import site
+import sys
+
+
+def _prefer_newer_python_sites() -> None:
+    """Ensure test imports prefer user/local site-packages over distro site-packages."""
+    preferred = []
+
+    try:
+        preferred.append(site.getusersitepackages())
+    except Exception:
+        pass
+
+    for path in list(sys.path):
+        if path.startswith("/usr/local/lib/python") and path.endswith("/dist-packages"):
+            preferred.append(path)
+
+    ordered = []
+    seen = set()
+    for path in preferred:
+        if path and path not in seen:
+            ordered.append(path)
+            seen.add(path)
+
+    for path in reversed(ordered):
+        if path in sys.path:
+            sys.path.remove(path)
+        sys.path.insert(0, path)
+
+
+_prefer_newer_python_sites()