Add Encoding while saving kernel log for CLH testcase

This will add encoding while opening file to save kernel
logs under Cloud-Hypervisor testcase.

This is needed while running this test on windows to
resolve UnicodeEncodeError.

Signed-off-by: Smit Gardhariya <[email protected]>

microsoft/testsuites/cloud_hypervisor/ch_tests_tool.py

@@ -404,7 +404,7 @@ def _save_kernel_logs(self, log_path: Path) -> None:
         else:
             dmesg_str = self.node.tools[Dmesg].get_output(force_run=True)
             dmesg_path = log_path / "dmesg"
-            with open(str(dmesg_path), "w") as f:
+            with open(str(dmesg_path), "w", encoding='utf-8') as f:
                 f.write(dmesg_str)