fix the wrong key in DPU address get from DHCP_SERVER_IPV4_PORT table Issue #288

[aronovic]

Fixes #288

Why I did it

gnmi_set.go:203] Set failed: rpc error: code = NotFound desc = Get ZMQ client failed: Get ZMQ address failed: Get DPU address failed: Can't read bridge-midplane|dpu1:ips from DHCP_SERVER_IPV4_PORT table

How I did it

Modified the key from ips to ips@ as expected in the table

How to verify it

Executed my gnmi client and was able to retrieve the entry successfully

Which release branch to backport (provide reason below if selected)

• 201811
• 201911
• 202006
• 202012
• 202106
• 202111

Description for the changelog

Modified the key used for DPU address retrieval by gnmi_set from DHCP_SERVER_IPV4_PORT table

Link to config_db schema for YANG module changes

N/A

A picture of a cute animal (not mandatory but encouraged)

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: aronovic (1427d39, 209f818, b866631)

[ganglyu]

Please fix EasyCLA

[sallylsy]

Component test failed

=== RUN   TestGetDpuAddress
    client_test.go:741: get DPU address failed: Can't read bridge-midplane|dpu0:ips@ from DHCP_SERVER_IPV4_PORT table
    client_test.go:745: get DPU address failed: 
    client_test.go:761: get invalid DPU address failed
--- FAIL: TestGetDpuAddress (0.01s)

Please fix