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Ignore duplicate messages (#299)

When watching packet captures, I noticed that zeroconf was processing
incoming data 3x on a my Home Assistant OS install because there are
three interfaces.

We can skip processing duplicate packets in order to reduce the overhead
of decoding data we have already processed.

Before

Idle cpu ~8.3%

recvfrom 4 times

    267   recvfrom(7, "\0\0\204\0\0\0\0\1\0\0\0\0\v_esphomelib\4_tcp\5local\0\0\f\0\1\0\0\21\224\0\31\26masterbed_tvcabinet_32\300\f", 8966, 0, {sa_family=AF_INET, sin_port=htons(5353), sin_addr=inet_addr("192.168.210.102")}, [16]) = 71
    267   recvfrom(7, "\0\0\204\0\0\0\0\1\0\0\0\0\v_esphomelib\4_tcp\5local\0\0\f\0\1\0\0\21\224\0\31\26masterbed_tvcabinet_32\300\f", 8966, 0, {sa_family=AF_INET, sin_port=htons(5353), sin_addr=inet_addr("172.30.32.1")}, [16]) = 71
    267   recvfrom(8, "\0\0\204\0\0\0\0\1\0\0\0\0\v_esphomelib\4_tcp\5local\0\0\f\0\1\0\0\21\224\0\31\26masterbed_tvcabinet_32\300\f", 8966, 0, {sa_family=AF_INET, sin_port=htons(5353), sin_addr=inet_addr("192.168.210.102")}, [16]) = 71
    267   recvfrom(8, "\0\0\204\0\0\0\0\1\0\0\0\0\v_esphomelib\4_tcp\5local\0\0\f\0\1\0\0\21\224\0\31\26masterbed_tvcabinet_32\300\f", 8966, 0, {sa_family=AF_INET, sin_port=htons(5353), sin_addr=inet_addr("172.30.32.1")}, [16]) = 71

sendto 8 times

    267   sendto(8, "\0\0\204\0\0\0\0\1\0\0\0\3\17_home-assistant\4_tcp\5local\0\0\f\0\1\0\0\21\224\0\7\4Home\300\f\3002\0!\200\1\0\0\0x\0)\0\0\0\0\37\273 66309dfc726446799c8a2c0f1cb0480f\300!\3002\0\20\200\1\0\0\21\224\0\305\22location_name=Home%uuid=66309dfc726446799c8a2c0f1cb0480f\24version=0.116.0.dev0\rexternal_url=(internal_url=http://192.168.213.154:8123$base_url=http://192.168.213.154:8123\32requires_api_password=True\300K\0\1\200\1\0\0\0x\0\4\300\250\325\232", 335, 0, {sa_family=AF_INET, sin_port=htons(5353), sin_addr=inet_addr("224.0.0.251")}, 16) = 335
    267   sendto(8, "\0\0\204\0\0\0\0\1\0\0\0\3\17_home-assistant\4_tcp\5local\0\0\f\... (continued)

619 of 736 branches covered (84.1%)

2417 of 2591 relevant lines covered (93.28%)

0.93 hits per line