[syslog] enable/disable syslog rate limit feature in fixture (#10986)

Feature syslog rate limit has been disabled by default to avoid consume CPU cycles during warm / fast reboot. There are new CLIs to enable/disable it. The PR is to automatically enable it before syslog rate limit test and disable it after.

Summary:
In fixture "restore_rate_limit", enable the feature at beginning, disable the feature at the end.

Change-Id: I61545db602d579fa0f337686427235c6d04998c7

tests/syslog/test_syslog_rate_limit.py

@@ -51,6 +51,13 @@ def restore_rate_limit(rand_selected_dut):
     Args:
         rand_selected_dut (object): DUT host object
     """
+    output = rand_selected_dut.command('config syslog --help')['stdout']
+    manually_enable_feature = False
+    if 'rate-limit-feature' in output:
+        # in 202305, the feature is disabled by default for warmboot/fastboot
+        # performance, need manually enable it via command
+        rand_selected_dut.command('config syslog rate-limit-feature enable')
+        manually_enable_feature = True
     container_data = rand_selected_dut.show_and_parse('show syslog rate-limit-container')
     host_data = rand_selected_dut.show_and_parse('show syslog rate-limit-host')
 
@@ -63,6 +70,8 @@ def restore_rate_limit(rand_selected_dut):
     rand_selected_dut.command('config syslog rate-limit-host -b {} -i {}'.format(
         host_data[0]['burst'], host_data[0]['interval']))
     rand_selected_dut.command('config save -y')
+    if manually_enable_feature:
+        rand_selected_dut.command('config syslog rate-limit-feature disable')
 
 
 @pytest.mark.disable_loganalyzer

tests/test_pretest.py

@@ -163,6 +163,14 @@ def test_disable_rsyslog_rate_limit(duthosts, enum_dut_hostname):
         is_dhcp_server_enable = config_facts["ansible_facts"]["DEVICE_METADATA"]["localhost"]["dhcp_server"]
     except KeyError:
         is_dhcp_server_enable = None
+
+    output = duthost.command('config syslog --help')['stdout']
+    manually_enable_feature = False
+    if 'rate-limit-feature' in output:
+        # in 202305, the feature is disabled by default for warmboot/fastboot
+        # performance, need manually enable it via command
+        duthost.command('config syslog rate-limit-feature enable')
+        manually_enable_feature = True
     for feature_name, state in list(features_dict.items()):
         if 'enabled' not in state:
             continue
@@ -175,6 +183,8 @@ def test_disable_rsyslog_rate_limit(duthosts, enum_dut_hostname):
             if "sonic-telemetry" not in output:
                 continue
         duthost.modify_syslog_rate_limit(feature_name, rl_option='disable')
+    if manually_enable_feature:
+        duthost.command('config syslog rate-limit-feature disable')
 
 
 def collect_dut_lossless_prio(dut):