[Thinkit] Re-mask packet-dropping bug, Added helper function which returns an EK_PHYSICAL_PORT name given an EK_PORT name, Add ingress and egress port parameters to QoS test, Enable modify in smoke test, gNMI port breakout tests, BERT test, Ensure that P4RT port IDs are properly reflected in the State path before considering switch configured, Ensure that P4RT port IDs in testbed are mirrored & Remove duplicate code from switch_test_setup_helpers test.

[Thinkit] Re-mask packet-dropping bug, Added helper function which returns an EK_PHYSICAL_PORT name given an EK_PORT name, Add ingress and egress port parameters to QoS test, Enable modify in smoke test, gNMI port breakout tests, BERT test, Ensure that P4RT port IDs are properly reflected in the State path before considering switch configured, Ensure that P4RT port IDs in testbed are mirrored & Remove duplicate code from switch_test_setup_helpers test. #4535