Items should not be removed during iteration

Error message
```
Traceback (most recent call last):
  File "/usr/local/lib/python3.4/dist-packages/ryu/base/app_manager.py",
line 290, in _event_loop
    handler(ev)
  File "/usr/local/lib/python3.4/dist-packages/ryu/topology/switches.py",
line 821, in lldp_packet_in_handler
    for host in self.hosts.values():
RuntimeError: dictionary changed size during iteration
```

-- 
Yi Tseng (a.k.a Takeshi)
Taiwan National Chiao Tung University
Department of Computer Science
W2CNLab

http://takeshi.tw

Attachment: 0001-Fix-RuntimeError-of-lldp_packet_in_handler.patch
Description: Binary data

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