[build-failure-fix][GCU] Sort referrer paths alphabetically (#2015)

Author: ghooo

generic_config_updater/gu_common.py

@@ -423,6 +423,7 @@ def _find_leafref_paths(self, path, config):
                 ref_paths.append(ref_path)
                 ref_paths_set.add(ref_path)
 
+        ref_paths.sort()
         return ref_paths
 
     def _get_inner_leaf_xpaths(self, xpath, sy):

tests/generic_config_updater/gu_common_test.py

@@ -639,13 +639,13 @@ def test_find_ref_paths__path_is_table__returns_ref_paths(self):
         # Arrange
         path = "/PORT"
         expected = [
-            "/ACL_TABLE/NO-NSW-PACL-V4/ports/0",
-            "/VLAN_MEMBER/Vlan1000|Ethernet0",
             "/ACL_TABLE/DATAACL/ports/0",
-            "/ACL_TABLE/EVERFLOWV6/ports/0",
-            "/VLAN_MEMBER/Vlan1000|Ethernet4",
             "/ACL_TABLE/EVERFLOW/ports/0",
+            "/ACL_TABLE/EVERFLOWV6/ports/0",
             "/ACL_TABLE/EVERFLOWV6/ports/1",
+            "/ACL_TABLE/NO-NSW-PACL-V4/ports/0",
+            "/VLAN_MEMBER/Vlan1000|Ethernet0",
+            "/VLAN_MEMBER/Vlan1000|Ethernet4",
             "/VLAN_MEMBER/Vlan1000|Ethernet8"
         ]
 
@@ -659,14 +659,14 @@ def test_find_ref_paths__whole_config_path__returns_all_refs(self):
         # Arrange
         path = ""
         expected = [
-            "/VLAN_MEMBER/Vlan1000|Ethernet0",
-            "/VLAN_MEMBER/Vlan1000|Ethernet4",
-            "/VLAN_MEMBER/Vlan1000|Ethernet8",
-            "/ACL_TABLE/NO-NSW-PACL-V4/ports/0",
             "/ACL_TABLE/DATAACL/ports/0",
-            "/ACL_TABLE/EVERFLOWV6/ports/0",
             "/ACL_TABLE/EVERFLOW/ports/0",
+            "/ACL_TABLE/EVERFLOWV6/ports/0",
             "/ACL_TABLE/EVERFLOWV6/ports/1",
+            "/ACL_TABLE/NO-NSW-PACL-V4/ports/0",
+            "/VLAN_MEMBER/Vlan1000|Ethernet0",
+            "/VLAN_MEMBER/Vlan1000|Ethernet4",
+            "/VLAN_MEMBER/Vlan1000|Ethernet8",
         ]
 
         # Act