[Test Gap][LAG][t0-64] Applying lag members configuration is not awaited

[illia-kotvitskyi]

Test Gap Description

As part of test_lag_member_forwarding_packets test we disable portchannel members by swssconfig.

Once the swssconfig command finished, we are sending traffic to ensure it will be dropped.

The issue here is that swssconfig command finished its execution before the config actually was applied:

Test logs:
AnsibleModule::shell Result => {"changed": true, "stdout": "", "stderr": "", "rc": 0, "cmd": "docker exec -i swss swssconfig /dev/stdin < /tmp/tmp.u3nD3MuRDV", "start": "2025-02-19 10:01:18.090075", "end": "2025-02-19 10:01:18.166119"
Finished at 2025-02-19 10:01:18.166119

Switch logs:

2025 Feb 19 10:01:18.161836 r-tigon-20 NOTICE swss#swssconfig: :- main: Loading config from JSON file:/dev/stdin...
2025 Feb 19 10:01:18.437393 r-tigon-20 NOTICE syncd#SDK: [SAI_UTILS.NOTICE] ./src/mlnx_sai_utils.c[1969]- set_dispatch_attrib_handler: Set EGRESS_DISABLE, key:LAG_MEMBER [OID:0x100690000001B] [log_port:0x10069, lag_log_id:0x0], val:true
2025 Feb 19 10:01:18.439446 r-tigon-20 NOTICE swss#orchagent: :- setDistributionOnLagMember: Disable distribution on LAG member Ethernet0
2025 Feb 19 10:01:18.440116 r-tigon-20 NOTICE syncd#SDK: [SAI_UTILS.NOTICE] ./src/mlnx_sai_utils.c[1969]- set_dispatch_attrib_handler: Set INGRESS_DISABLE, key:LAG_MEMBER [OID:0x100690000001B] [log_port:0x10069, lag_log_id:0x0], val:true
2025 Feb 19 10:01:18.441281 r-tigon-20 NOTICE swss#orchagent: :- setCollectionOnLagMember: Disable collection on LAG member Ethernet0
2025 Feb 19 10:01:18.442631 r-tigon-20 NOTICE syncd#SDK: [SAI_UTILS.NOTICE] ./src/mlnx_sai_utils.c[1969]- set_dispatch_attrib_handler: Set EGRESS_DISABLE, key:LAG_MEMBER [OID:0x1006B0000001B] [log_port:0x1006B, lag_log_id:0x0], val:true
2025 Feb 19 10:01:18.444374 r-tigon-20 NOTICE swss#orchagent: :- setDistributionOnLagMember: Disable distribution on LAG member Ethernet4
2025 Feb 19 10:01:18.445108 r-tigon-20 NOTICE syncd#SDK: [SAI_UTILS.NOTICE] ./src/mlnx_sai_utils.c[1969]- set_dispatch_attrib_handler: Set INGRESS_DISABLE, key:LAG_MEMBER [OID:0x1006B0000001B] [log_port:0x1006B, lag_log_id:0x0], val:true
2025 Feb 19 10:01:18.446193 r-tigon-20 NOTICE swss#orchagent: :- setCollectionOnLagMember: Disable collection on LAG member Ethernet4

Actual configuration applied at 2025 Feb 19 10:01:18.446193

We should wait until the configuration applied, otherwise some traffic will still not be dropped causing test to fail

Test Plan

No response

Test environment

topo: t0-64

Attach files (if any)

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