[acl/test_src_mac_rewrite]: Fix ACL counter and acl modification handling

[Aakash Tiwari (aakashtiwari2630-max)]

Porting master PR - sonic-net/sonic-mgmt#25114

Summary of the fix:

1. In case of range test, the test aim is to send multiple packets and validate acl counters but after sending first packet, the wait_until logic was wrong due to which the count_after was read incorrectly. Fix is to pass the correct previous counter so that count after is incremented correctly.
2. Modify ACL rule tries to modify Mac field in acl rule by doing a HSET call in APP_DB in redis. This doesn't update the STATE_DB. Correct way is to call setup_acl_rules with updated mac.
3. _check_vxlan_tunnel_config was checking the APP_DB incorrectly. Fixed it.

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