Add python <3.6 compatibility

bin/xymon-vulnerabilities.py

@@ -32,7 +32,7 @@ def run_check(xymon):
         title = ''.join([vuln, ': '])
         vuln_file = Path(''.join([cpu_vulnerabilities_base, vuln]))
         if vuln_file.is_file():
-            with open(vuln_file) as f:
+            with open(str(vuln_file)) as f:
                 content = '<br/>'.join(f.readlines())
             if content.startswith('Vulnerable'):
                 title += 'Vulnerable'