tests: Extend SRv6 static SIDs topotest to verify SID structure

The `static_srv6_sids` topotest verifies that staticd correctly
programs the SIDs in the zebra RIB. Currently, the topotest only
validates the programmed behavior and SID attributes.

This commit extends the topotest to also validate the SID structure.

Signed-off-by: Carmine Scarpitta <cscarpit@cisco.com>

Author: cscarpitta

tests/topotests/static_srv6_sids/expected_srv6_sids.json

@@ -25,7 +25,13 @@
 					"active": true,
 					"weight": 1,
 					"seg6local": {
-						"action": "End"
+						"action": "End",
+						"sidStructure": {
+							"blockLen": 32,
+							"nodeLen": 16,
+							"funcLen": 0,
+							"argLen": 0
+						}
 					},
 					"seg6localContext": {
 
@@ -60,7 +66,13 @@
 					"active": true,
 					"weight": 1,
 					"seg6local": {
-						"action": "End.DT4"
+						"action": "End.DT4",
+						"sidStructure": {
+							"blockLen": 32,
+							"nodeLen": 16,
+							"funcLen": 16,
+							"argLen": 0
+						}
 					},
 					"seg6localContext": {
 						"table": 10
@@ -95,7 +107,13 @@
 					"active": true,
 					"weight": 1,
 					"seg6local": {
-						"action": "End.DT6"
+						"action": "End.DT6",
+						"sidStructure": {
+							"blockLen": 32,
+							"nodeLen": 16,
+							"funcLen": 16,
+							"argLen": 0
+						}
 					},
 					"seg6localContext": {
 						"table": 20
@@ -130,7 +148,13 @@
 					"active": true,
 					"weight": 1,
 					"seg6local": {
-						"action": "End.DT46"
+						"action": "End.DT46",
+						"sidStructure": {
+							"blockLen": 32,
+							"nodeLen": 16,
+							"funcLen": 16,
+							"argLen": 0
+						}
 					},
 					"seg6localContext": {
 						"table": 30

tests/topotests/static_srv6_sids/expected_srv6_sids_sid_delete_1.json

@@ -25,7 +25,13 @@
 					"active": true,
 					"weight": 1,
 					"seg6local": {
-						"action": "End.DT4"
+						"action": "End.DT4",
+						"sidStructure": {
+							"blockLen": 32,
+							"nodeLen": 16,
+							"funcLen": 16,
+							"argLen": 0
+						}
 					},
 					"seg6localContext": {
 						"table": 10
@@ -60,7 +66,13 @@
 					"active": true,
 					"weight": 1,
 					"seg6local": {
-						"action": "End.DT6"
+						"action": "End.DT6",
+						"sidStructure": {
+							"blockLen": 32,
+							"nodeLen": 16,
+							"funcLen": 16,
+							"argLen": 0
+						}
 					},
 					"seg6localContext": {
 						"table": 20
@@ -95,7 +107,13 @@
 					"active": true,
 					"weight": 1,
 					"seg6local": {
-						"action": "End.DT46"
+						"action": "End.DT46",
+						"sidStructure": {
+							"blockLen": 32,
+							"nodeLen": 16,
+							"funcLen": 16,
+							"argLen": 0
+						}
 					},
 					"seg6localContext": {
 						"table": 30

tests/topotests/static_srv6_sids/expected_srv6_sids_sid_delete_2.json

@@ -25,7 +25,13 @@
 					"active": true,
 					"weight": 1,
 					"seg6local": {
-						"action": "End.DT4"
+						"action": "End.DT4",
+						"sidStructure": {
+							"blockLen": 32,
+							"nodeLen": 16,
+							"funcLen": 16,
+							"argLen": 0
+						}
 					},
 					"seg6localContext": {
 						"table": 10
@@ -60,7 +66,13 @@
 					"active": true,
 					"weight": 1,
 					"seg6local": {
-						"action": "End.DT46"
+						"action": "End.DT46",
+						"sidStructure": {
+							"blockLen": 32,
+							"nodeLen": 16,
+							"funcLen": 16,
+							"argLen": 0
+						}
 					},
 					"seg6localContext": {
 						"table": 30