[backend] Loading backend ACL removes the ACL rules loaded previously

[bingwang-ms]

Description

PR #14229 added a service for loading backend ACL rules. There is an issue in below code in backend_acl.py.

sonic-buildimage/files/image_config/backend_acl/backend_acl.py

Lines 80 to 81 in 2ba3c90

	if os.path.isfile(BACKEND_ACL_FILE):
	run_command(['acl-loader', 'update', 'incremental', BACKEND_ACL_FILE])

Because table_name is not specified when calling acl-loader, the ACL rules loaded previously will be cleared.

Steps to reproduce the issue:

1. Run config load_minigraph
2. Check ACL rules on the device

Describe the results you received:

The ACL rules should not be cleared by backend-acl service.

Describe the results you expected:

Output of show version:

SONiC Software Version: SONiC.20201231.118
Distribution: Debian 10.13
Kernel: 4.19.0-12-2-amd64
Build commit: 2e55bdeb8c
Build date: Wed Dec 13 00:14:17 UTC 2023
Built by: cloudtest@36ffe988c000000

Output of show techsupport:

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Additional information you deem important (e.g. issue happens only occasionally):