[IPv6]: Add IPv6 mgmt gateway address to server#2119

Merged

SuvarnaMeenakshi merged 3 commits intosonic-net:masterfrom

SuvarnaMeenakshi:mgmt_gw_ipv6

Sep 1, 2020

Commits on Aug 20, 2020

Commits on Aug 27, 2020

Fix to ensure that ipv6 route is added in ptf-docker only if
SuvarnaMeenakshi
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