[auto-ts] Fix and stabilize auto-techsupport tests#5986

ZhaohuiS merged 3 commits intosonic-net:mastersonic-net/sonic-mgmt:masterfrom

AndriiLozovyi:fix_and_stabilize_auto_tsAndriiLozovyi/sonic-mgmt:fix_and_stabilize_auto_tsCopy head branch name to clipboard