[ycabled] [active-standby] add changes for correcting telemetry values for 'active-standby' when the cable is present but vendor name and part number is not recognized (sonic-net#478)

* [ycabled] [active-standby] add changes for correcting telemetry values
for 'active-standby' when the cable is present but vendor name and part
number is not recognized

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

* add tests

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

---------

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

Author: vdahiya12

sonic-ycabled/tests/test_y_cable_helper.py

@@ -1135,6 +1135,8 @@ def test_create_tables_and_insert_mux_unknown_entries(self):
         static_tbl[asic_index] = swsscommon.Table(
             test_db[asic_index], "STATIC_TABLE")
         static_tbl[asic_index].get.return_value = (status, fvs)
+        mux_tbl[asic_index] = swsscommon.Table(
+            test_db[asic_index], "STATIC_TABLE")
 
         rc = create_tables_and_insert_mux_unknown_entries(
             state_db, y_cable_tbl, static_tbl, mux_tbl, asic_index, logical_port_name)
@@ -1610,6 +1612,8 @@ def test_check_identifier_presence_and_update_mux_table_entry_module_microsoft_y
             test_db[asic_index], swsscommon.STATE_HW_MUX_CABLE_TABLE_NAME)
         static_tbl[asic_index] = swsscommon.Table(
             test_db[asic_index], MUX_CABLE_STATIC_INFO_TABLE)
+        mux_tbl[asic_index] = swsscommon.Table(
+            test_db[asic_index], "MUX_CABLE_INFO")
 
         port_tbl[asic_index] = swsscommon.Table(
             test_db[asic_index], "PORT_INFO_TABLE")

sonic-ycabled/ycable/ycable_utilities/y_cable_helper.py

@@ -1151,6 +1151,7 @@ def create_tables_and_insert_mux_unknown_entries(state_db, y_cable_tbl, static_t
     # fill the newly found entry
     read_y_cable_and_update_statedb_port_tbl(
         logical_port_name, y_cable_tbl[asic_index])
+    post_port_mux_info_to_db(logical_port_name,  mux_tbl, asic_index, y_cable_tbl, 'pseudo-cable')
     post_port_mux_static_info_to_db(
         logical_port_name, static_tbl[asic_index], y_cable_tbl)