db, state: keep the ephemeral flag a node was created with

The flag moves from the key to the node, so a login with another key no
longer changes it. A user claiming a tagged node still clears it. v1
nodes carry the flag.

hscontrol/testdata/apiv1_golden/TestAPIV1AuthRegister_happy_path_parity.json

@@ -6,6 +6,7 @@
       "availableRoutes": [],
       "createdAt": "\u003ctimestamp\u003e",
       "discoKey": "\u003csecret\u003e",
+      "ephemeral": false,
       "expiry": null,
       "givenName": "regnode",
       "id": "1",

hscontrol/testdata/apiv1_golden/TestAPIV1NodeGet_happy_parity.json

@@ -6,6 +6,7 @@
       "availableRoutes": [],
       "createdAt": "\u003ctimestamp\u003e",
       "discoKey": "\u003csecret\u003e",
+      "ephemeral": false,
       "expiry": null,
       "givenName": "node-a",
       "id": "1",

hscontrol/testdata/apiv1_golden/TestAPIV1NodeGet_tagged_node_parity.json

@@ -6,6 +6,7 @@
       "availableRoutes": [],
       "createdAt": "\u003ctimestamp\u003e",
       "discoKey": "\u003csecret\u003e",
+      "ephemeral": false,
       "expiry": null,
       "givenName": "node-b",
       "id": "1",

hscontrol/testdata/apiv1_golden/TestAPIV1NodeList_all_parity.json

@@ -7,6 +7,7 @@
         "availableRoutes": [],
         "createdAt": "\u003ctimestamp\u003e",
         "discoKey": "\u003csecret\u003e",
+        "ephemeral": false,
         "expiry": null,
         "givenName": "node-a",
         "id": "1",
@@ -55,6 +56,7 @@
         "availableRoutes": [],
         "createdAt": "\u003ctimestamp\u003e",
         "discoKey": "\u003csecret\u003e",
+        "ephemeral": false,
         "expiry": null,
         "givenName": "node-b",
         "id": "2",

hscontrol/testdata/apiv1_golden/TestAPIV1NodeList_filter_by_user_parity.json

@@ -7,6 +7,7 @@
         "availableRoutes": [],
         "createdAt": "\u003ctimestamp\u003e",
         "discoKey": "\u003csecret\u003e",
+        "ephemeral": false,
         "expiry": null,
         "givenName": "node-a",
         "id": "1",

hscontrol/testdata/apiv1_golden/TestAPIV1NodeRegister_happy_parity.json

@@ -6,6 +6,7 @@
       "availableRoutes": [],
       "createdAt": "\u003ctimestamp\u003e",
       "discoKey": "\u003csecret\u003e",
+      "ephemeral": false,
       "expiry": null,
       "givenName": "registered-node",
       "id": "1",