Merge branch 'ldoktor-broken-can-sudo'

Signed-off-by: NAmador Pahim <apahim@redhat.com>

avocado/utils/process.py

@@ -111,12 +111,15 @@ def can_sudo(cmd=None):
     except path.CmdNotFoundError:
         return False
 
+    try:
         if cmd:     # Am I able to run the cmd or plain sudo id?
             return not system(cmd, ignore_status=True, sudo=True)
         elif system_output("id -u", ignore_status=True, sudo=True).strip() == "0":
             return True
         else:
             return False
+    except OSError:     # Broken sudo binary
+        return False
 
 
 def pid_exists(pid):