Don't consume data when processing Device_annce message.

[Adminiuga]

When receiving ZDO Device Announcement message (ZDO req 0x0013) leave data intact to allow successful deserialization later, since latest changes in Zigpy we enforce strict data length for proper deserialization.
Here's an example of the error:

2019-06-11 21:47:07 INFO (MainThread) [zigpy_deconz.zigbee.application] New device joined: 0x9ce9, f0:d1:b8:00:00:05:13:93
2019-06-11 21:47:07 INFO (MainThread) [zigpy.application] Device 0x9ce9 (f0:d1:b8:00:00:05:13:93) joined the network
2019-06-11 21:47:07 DEBUG (MainThread) [zigpy.application] Skip initialization for existing device f0:d1:b8:00:00:05:13:93
2019-06-11 21:47:07 ERROR (MainThread) [zigpy_deconz.zigbee.application] Failed to parse message (b'9313050000b8d1f08e') on cluster 19, because Data is too short to contain 1 bytes

as you can see in b'9313050000b8d1f08e' it has only the IEEE 9313050000b8d1f0 and capability bitmap 8e, but misses NWK since it was consumed earlier, so the whole deserialization fails.