ipv6 address family

[NEWPLAN]

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I use horovod to launch discributed training tasks, and my cluster has been migirated to ipv6 family. However, the horovod.runner donot support the cluster with throwing errors, including but not limited to:

1. address parser at "[e-mail]", the function requires ip addresses inputed are int the format of "IP:slot-nums", which conflcts with the ipv6 format.
2. server listen at "[e-mail]", the addr=("",port) would generate a ipv4 addr.
3. [e-mail], fail to support ipv6 family.

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current, I just add an environment to force the code execute with ipv6 branch, hoping a better solution from the official.

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the horovod I used is based on pip3 install with a version=0.28.1