[ACL] Fix ACL rules are not ready yet when test cases are started in …

…as5835_54t model (sonic-net#2961)

What is the motivation for this PR?
Fix failed test cases in as5835_54t model.

How did you do it?
Check output of aclshow -a command and ensure that one or more rules are able to displayed and values of counters are not N/A.

How did you verify/test it?
Run the modified code in as5835_54t model to ensure that the problem is fixed.

tests/acl/test_acl.py

@@ -18,6 +18,7 @@
 from tests.common.plugins.loganalyzer.loganalyzer import LogAnalyzer, LogAnalyzerError
 from tests.common.fixtures.duthost_utils import backup_and_restore_config_db_module
 from tests.common.fixtures.ptfhost_utils import copy_arp_responder_py
+from tests.common.utilities import wait_until
 from tests.conftest import duthost
 
 logger = logging.getLogger(__name__)
@@ -150,7 +151,7 @@ def setup(duthosts, rand_one_dut_hostname, tbinfo, ptfadapter):
     vlan_ports = []
 
     if topo == "t0":
-        vlan_ports = [mg_facts["minigraph_ptf_indices"][ifname] 
+        vlan_ports = [mg_facts["minigraph_ptf_indices"][ifname]
                       for ifname in mg_facts["minigraph_vlans"].values()[0]["members"]]
 
     setup_information = {
@@ -396,6 +397,9 @@ def acl_rules(self, duthosts, rand_one_dut_hostname, localhost, setup, acl_table
                 self.setup_rules(duthost, acl_table, ip_version)
 
             self.post_setup_hook(duthost, localhost, populate_vlan_arp_entries, tbinfo)
+
+            assert self.check_rule_counters(duthost), "Rule counters should be ready!"
+
         except LogAnalyzerError as err:
             # Cleanup Config DB if rule creation failed
             logger.error("ACL rule application failed, attempting to clean-up...")
@@ -463,6 +467,21 @@ def direction(self, request):
         """Parametrize test based on direction of traffic."""
         return request.param
 
+    def check_rule_counters(self, duthost):
+        logger.info('Wait all rule counters are ready')
+
+        return wait_until(60, 2, self.check_rule_counters_internal, duthost)
+
+    def check_rule_counters_internal(self, duthost):
+        res = duthost.command('aclshow -a')
+
+        num_of_lines = len(res['stdout'].split('\n'))
+
+        if num_of_lines <= 2 or 'N/A' in res['stdout']:
+            return False
+
+        return True
+
     def get_src_port(self, setup, direction):
         """Get a source port for the current test."""
         src_ports = setup["downstream_port_ids"] if direction == "downlink->uplink" else setup["upstream_port_ids"]