Interop: FileNotFoundError - in create_xunit_results method
```
2021-11-24 11:02:29,361 - utility.xunit - INFO - Creating xUnit result file for test suite: suites/nautilus/cephfs/tier-0_fs.yaml
Traceback (most recent call last):
  File "run.py", line 1127, in <module>
    rc = run(args)
  File "run.py", line 1044, in run
    create_xunit_results(suite_name, tcs, run_dir)
  File "/home/psathyan/source/cephci/utility/xunit.py", line 37, in create_xunit_results
    xml.write(xml_file, pretty=True)
  File "/home/psathyan/venv/cephci.venv/lib64/python3.6/site-packages/junitparser/junitparser.py", line 310, in write
    write_xml(self, filepath=filepath, pretty=pretty)
  File "/home/psathyan/venv/cephci.venv/lib64/python3.6/site-packages/junitparser/junitparser.py", line 50, in write_xml
    with open(filepath, "wb") as xmlfile:
FileNotFoundError: [Errno 2] No such file or directory: '/tmp/cephci-run-Y457FX/suites/nautilus/cephfs/tier-0_fs.yaml.xml'
```
One of the recent changes has broken this feature.
diff --git a/utility/xunit.py b/utility/xunit.py
index 22c1851b..88ffe8dd 100644
--- a/utility/xunit.py
+++ b/utility/xunit.py
@@ -18,7 +18,8 @@ def create_xunit_results(suite_name, test_cases, run_dir):
 
     Returns: None
     """
-    xml_file = f"{run_dir}/{suite_name}.xml"
+    _file = suite_name.split("/")[-1]
+    xml_file = f"{run_dir}/{_file}.xml"
 
     log.info(f"Creating xUnit result file for test suite: {suite_name}")
 
['utility/xunit.py']