[meta] Add support for ignored attributes names (sonic-net#836)

During SAI development, some existing attributes could be deprecated and marked ignored in headers, but old value name still can be used in redis database in current running systems. When doing sonic upgrade, old value needs to be correctly interpreted and translated to new name. This PR addresses this issue.

meta/saiserialize.cpp

@@ -3305,6 +3305,12 @@ void sai_deserialize_attr_id(
 
     auto m = sai_metadata_get_attr_metadata_by_attr_id_name(s.c_str());
 
+    if (m == NULL)
+    {
+        // check ignored attributes names for backward compatibility
+        m = sai_metadata_get_ignored_attr_metadata_by_attr_id_name(s.c_str());
+    }
+
     if (m == NULL)
     {
         SWSS_LOG_THROW("invalid attr id: %s", s.c_str());

tests/BCM56850.pl

@@ -681,8 +681,16 @@ sub test_sairedis_client
     }
 }
 
+sub test_ignore_attributes
+{
+    fresh_start;
+
+    play "ignore_attributes.rec";
+}
+
 # RUN TESTS
 
+test_ignore_attributes;
 test_sairedis_client;
 test_macsec_p2p_establishment;
 test_no_lag_label;

tests/BCM56850/ignore_attributes.rec

@@ -0,0 +1,7 @@
+2017-06-14.01:55:46.543987|a|INIT_VIEW
+2017-06-14.01:55:46.551164|A|SAI_STATUS_SUCCESS
+2017-06-14.01:55:46.555975|c|SAI_OBJECT_TYPE_SWITCH:oid:0x21000000000000|SAI_SWITCH_ATTR_INIT_SWITCH=true
+2017-06-14.01:56:05.520538|g|SAI_OBJECT_TYPE_SWITCH:oid:0x21000000000000|SAI_SWITCH_ATTR_PORT_NUMBER=0
+2017-06-14.01:56:05.525938|G|SAI_STATUS_SUCCESS|SAI_SWITCH_ATTR_PORT_NUMBER=32
+2017-06-14.01:56:06.151337|a|APPLY_VIEW
+2017-06-14.01:56:06.156740|A|SAI_STATUS_SUCCESS