[show] fix show muxcable metrics <port> for sorted output (#1731)

This PR fixes the display for show muxcable metrics by sorting the output based on the time of the event.
This is required for better display.
For example

admin@str2-7050cx3-acs-12:~$ show mux metrics Ethernet0
PORT EVENT TIME
--------- --------------------------- ---------------------------
Ethernet0 xcvrd_switch_standby_start 2021-Jul-21 02:03:28.784027
Ethernet0 orch_switch_standby_end 2021-Jul-21 02:03:28.788150
Ethernet0 linkmgrd_switch_standby_end 2021-Jul-21 02:03:28.790288

Signed-off-by: vaibhav-dahiya <vdahiya@microsoft.com>

show/muxcable.py

@@ -6,6 +6,8 @@
 import re
 import utilities_common.cli as clicommon
 from natsort import natsorted
+from collections import OrderedDict
+from operator import itemgetter
 from sonic_py_common import multi_asic
 from swsscommon.swsscommon import SonicV2Connector, ConfigDBConnector
 from swsscommon import swsscommon
@@ -1003,11 +1005,12 @@ def metrics(db, port, json_output):
         metrics_dict[asic_index] = per_npu_statedb[asic_index].get_all(
             per_npu_statedb[asic_index].STATE_DB, 'MUX_METRICS_TABLE|{}'.format(port))
 
+        ordered_dict = OrderedDict(sorted(metrics_dict[asic_index].items(), key=itemgetter(1)))
         if json_output:
-            click.echo("{}".format(json.dumps(metrics_dict[asic_index], indent=4)))
+            click.echo("{}".format(json.dumps(ordered_dict, indent=4)))
         else:
             print_data = []
-            for key, val in metrics_dict[asic_index].items():
+            for key, val in ordered_dict.items():
                 print_port_data = []
                 print_port_data.append(port)
                 print_port_data.append(key)

tests/muxcable_test.py

@@ -209,17 +209,17 @@
 PORT       EVENT                         TIME
 ---------  ----------------------------  ---------------------------
 Ethernet0  linkmgrd_switch_active_start  2021-May-13 10:00:21.420898
-Ethernet0  linkmgrd_switch_standby_end   2021-May-13 10:01:15.696728
-Ethernet0  xcvrd_switch_standby_end      2021-May-13 10:01:15.696051
 Ethernet0  xcvrd_switch_standby_start    2021-May-13 10:01:15.690835
+Ethernet0  xcvrd_switch_standby_end      2021-May-13 10:01:15.696051
+Ethernet0  linkmgrd_switch_standby_end   2021-May-13 10:01:15.696728
 """
 
 show_muxcable_metrics_expected_output_json = """\
 {
     "linkmgrd_switch_active_start": "2021-May-13 10:00:21.420898",
-    "linkmgrd_switch_standby_end": "2021-May-13 10:01:15.696728",
+    "xcvrd_switch_standby_start": "2021-May-13 10:01:15.690835",
     "xcvrd_switch_standby_end": "2021-May-13 10:01:15.696051",
-    "xcvrd_switch_standby_start": "2021-May-13 10:01:15.690835"
+    "linkmgrd_switch_standby_end": "2021-May-13 10:01:15.696728"
 }
 """