Pin mesh-sdk 007b6fd, the release's final sdk, so the controller reads the release's manifests and composes as the group does (issue 774)

The sdk now refuses an offer that says no credential form (6b8c694, ADR 0570). So:
- the catalogue copy in testdata/beside is captured again at the release branch's catalogue 8ae8e88d, whose offers each
  say one, and the sdk's conformance events at 007b6fd, as CAPTURED asks;
- the fixtures of identity_bound_test and issued_test say the form their rows meant: pair for a login of each
  consumer's own, none for a keyless provision. No behaviour of the controller changed.

testdata/beside/mesh-catalog/modules/mounts/module.json.captured

@@ -5,11 +5,9 @@
     "nfs-share"
   ],
   "reads": [
+    "disk-load.readings",
     "nfs-server.exports"
   ],
-  "invokes": [
-    "seat:mesh-controller.data"
-  ],
   "capabilities": [
     "package-manager",
     "service-manager"
@@ -38,20 +36,20 @@
       "per-machine": true
     }
   ],
-    "config": {
-      "shares": {
-        "type": "string",
-        "description": "The shares of another machine this machine mounts: space-separated name=mountpoint, each optionally :ro, or none (novox/hq ADR 0263 rule 5).",
-        "trusted": true,
-        "default": "none"
-      },
-      "sources": {
-        "type": "string",
-        "description": "The occasional sources this machine mounts: space-separated name=smb://[<user>@]<host>/<share>@<mountpoint> or name=disk:<uuid>@<mountpoint>, each optionally :ro, or none (novox/hq ADR 0263 rule 6); an SMB source's username is in its entry, its password the secret smb-password-<name> (novox/hq ADR 0283).",
-        "trusted": true,
-        "default": "none"
-      }
+  "config": {
+    "shares": {
+      "type": "string",
+      "description": "The shares of another machine this machine mounts: space-separated name=mountpoint, each optionally :ro, or none (novox/hq ADR 0263 rule 5).",
+      "trusted": true,
+      "default": "none"
     },
+    "sources": {
+      "type": "string",
+      "description": "The occasional sources this machine mounts: space-separated name=smb://[<user>@]<host>/<share>@<mountpoint> or name=disk:<uuid>@<mountpoint>, each optionally :ro, or none (novox/hq ADR 0263 rule 6); an SMB source's username is in its entry, its password the secret smb-password-<name> (novox/hq ADR 0283).",
+      "trusted": true,
+      "default": "none"
+    }
+  },
   "own-secrets": {
     "smb-password-*": {
       "path": "${dir:state}/smb-password-*.secret",