auto-t: hostapd: catch local socket remove exception

This happens if hostapd is killed ungracefully which is done in
some tests.

autotests/util/hostapd.py

@@ -118,7 +118,11 @@ class HostapdCLI:
             return
 
         self.ctrl_sock.close()
+
+        try:
             os.remove(self.local_ctrl)
+        except:
+            pass
 
         if self._hostapd_restarted:
             ctx.stop_process(ctx.hostapd.process, force)