Add DMTF mockup fixtures and test helpers

Unmodified files from DMTF Redfish-Publications (public-rackmount1, public-localstorage, public-telemetry), only those the tests use, each set with DMTF's BSD-3-Clause license and a COMMANDS.txt naming the source commit and request paths.

conftest.py loads them by request path and serves a mockup over mocked HTTP, with a SessionService that hands out a token, for the transport tests.

tests/fixtures/dmtf-public-telemetry/Managers/1/NetworkProtocol/index.json

@@ -0,0 +1,61 @@
+{
+    "@odata.type": "#ManagerNetworkProtocol.v1_14_0.ManagerNetworkProtocol",
+    "Id": "NetworkProtocol",
+    "Name": "Manager Network Protocol",
+    "Description": "Manager Network Service Status",
+    "Status": {
+        "State": "Enabled",
+        "Health": "OK"
+    },
+    "HostName": "mymanager",
+    "FQDN": "mymanager.mydomain.com",
+    "HTTP": {
+        "ProtocolEnabled": true,
+        "Port": 80
+    },
+    "HTTPS": {
+        "ProtocolEnabled": true,
+        "Port": 443
+    },
+    "IPMI": {
+        "ProtocolEnabled": true,
+        "Port": 623
+    },
+    "SSH": {
+        "ProtocolEnabled": true,
+        "Port": 22
+    },
+    "SNMP": {
+        "ProtocolEnabled": true,
+        "Port": 161
+    },
+    "VirtualMedia": {
+        "ProtocolEnabled": true,
+        "Port": 17988
+    },
+    "SSDP": {
+        "ProtocolEnabled": true,
+        "Port": 1900,
+        "NotifyMulticastIntervalSeconds": 600,
+        "NotifyTTL": 5,
+        "NotifyIPv6Scope": "Site"
+    },
+    "Telnet": {
+        "ProtocolEnabled": true,
+        "Port": 23
+    },
+    "KVMIP": {
+        "ProtocolEnabled": true,
+        "Port": 5288
+    },
+    "NTP": {
+        "ProtocolEnabled": true,
+        "NTPServers": [
+            "0.pool.ntp.org",
+            "1.pool.ntp.org",
+            "time-a.nist.gov"
+        ]
+    },
+    "@odata.id": "/redfish/v1/Managers/1/NetworkProtocol",
+    "@Redfish.Copyright": "Copyright 2014-2026 DMTF. For the full DMTF copyright policy, see http://www.dmtf.org/about/policies/copyright."
+}