Implement the BGP Bounce Back Routing test script#2538

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wangxin merged 6 commits intosonic-net:masterfrom

wangxin:bgp_bbr

Nov 25, 2020

Commits on Nov 19, 2020

Commits on Nov 23, 2020

Commits on Nov 24, 2020

Explicitly enable bbr for bbr enabled cases
wangxin
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