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lcg-info does not try alternative IP addresses for replicated BDII

From https://ggus.eu/index.php?mode=ticket_info&ticket_id=140478:

lcg-info cannot exploit DNS-based BDII replication (load-balancing,high-availability) since it does not try alternative IP addresses:

$ host lcg-bdii.cern.ch
lcg-bdii.cern.ch has address 188.184.88.34
lcg-bdii.cern.ch has address 188.184.93.186
lcg-bdii.cern.ch has address 188.185.75.87
lcg-bdii.cern.ch has IPv6 address 2001:1458:d00:8::100:351
lcg-bdii.cern.ch has IPv6 address 2001:1458:201:e4::100:5b4
lcg-bdii.cern.ch has IPv6 address 2001:1458:201:e4::100:1c
$ strace -f lcg-info --list-ce --bdii lcg-bdii.cern.ch:2170 2>&1 |grep connect\(.*2170
connect(4, {sa_family=AF_INET, sin_port=htons(2170), sin_addr=inet_addr("188.184.88.34")}, 16) = -1 EINPROGRESS (Operation now in progress)
connect(4, {sa_family=AF_INET, sin_port=htons(2170), sin_addr=inet_addr("188.184.88.34")}, 16) = -1 ECONNREFUSED (Connection refused)

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