test_neighbor_mac_noptf failing in multi asic devices

[arlakshm]

Description

The test in file arp/test_neighbor_mac_noptf are failing on multi asic platforms. The tests fail with following error

self = <tests.arp.test_neighbor_mac_noptf.TestNeighborMacNoPtf instance at 0x7f11261d6780>
duthosts = <tests.common.devices.duthosts.DutHosts object at 0x7f1125516250>
enum_rand_one_per_hwsku_frontend_hostname = 'svcstr-nsonic-acs-1'

    @pytest.fixture(scope="module", autouse=True)
    def setupDutConfig(self, duthosts, enum_rand_one_per_hwsku_frontend_hostname):
        """
            Disabled BGP to reduce load on switch and restores DUT configuration after test completes
    
            Args:
                duthost (AnsibleHost): Device Under Test (DUT)
    
            Returns:
                None
        """
        duthost = duthosts[enum_rand_one_per_hwsku_frontend_hostname]
        duthost.command("sudo config bgp shutdown all")
        if not wait_until(120, 2.0, self._check_no_bgp_routes, duthost):
>           pytest.fail('BGP Shutdown Timeout: BGP route removal exceeded 120 seconds.')
E           Failed: BGP Shutdown Timeout: BGP route removal exceeded 120 seconds.

duthost    = <MultiAsicSonicHost> svcstr-nsonic-acs-1
duthosts   = <tests.common.devices.duthosts.DutHosts object at 0x7f1125516250>
enum_rand_one_per_hwsku_frontend_hostname = 'svcstr-nsonic-acs-1'
self       = <tests.arp.test_neighbor_mac_noptf.TestNeighborMacNoPtf instance at 0x7f11261d6780>

The PR #3369 introduced the change to count the routes. This change doesn't work on multi asic platform.