fix EOS get_bgp_config mismatch between neighbors and peer-group
fix EOS get_bgp_config mismatch between neighbors and peer-group

The peer-group syntax is deprecated since EOS 4.23.0
and replaced by 'peer group'.

OLD: neighbor 192.168.172.36 peer-group 4-public-anycast-peers
NEW: neighbor 192.168.172.36 peer group 4-public-anycast-peers

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