[route] Fix random loss of arp info in test_static_route_ecmp#6614

yaqiangz merged 2 commits intosonic-net:mastersonic-net/sonic-mgmt:masterfrom

yaqiangz:azure-master_fix_test_static_route_ecmpyaqiangz/sonic-mgmt:azure-master_fix_test_static_route_ecmpCopy head branch name to clipboard