zhanghao b09cde3210 Add bgp state metrics ...

This patch adds bgp state metrics as follows:
http://XXX:9324/metrics

bird_bgp_state{name="uplink0",proto="BGP",state="Active"} 1
bird_bgp_state{name="uplink1",proto="BGP",state="Idle"} 1

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..

bird_client.go

Add bgp state metrics

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client.go

Add bgp state metrics

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