Support webauthn (#17957)

Migrate from U2F to Webauthn

Co-authored-by: Andrew Thornton <art27@cantab.net>
Co-authored-by: 6543 <6543@obermui.de>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

vendor/github.com/google/certificate-transparency-go/gometalinter.json

@@ -0,0 +1,28 @@
+{
+  "Deadline": "60s",
+  "Linters": {
+    "license": "./scripts/check_license.sh:PATH:LINE:MESSAGE",
+    "forked": "./scripts/check_forked.sh:PATH:LINE:MESSAGE",
+    "unforked": "./scripts/check_unforked.sh:PATH:LINE:MESSAGE"
+  },
+  "Enable": [
+    "forked",
+    "gocyclo",
+    "gofmt",
+    "goimports",
+    "golint",
+    "license",
+    "misspell",
+    "unforked",
+    "vet"
+  ],
+  "Exclude": [
+    "x509/",
+    "asn1/",
+    ".+\\.pb\\.go",
+    ".+\\.pb\\.gw\\.go",
+    "mock_.+\\.go"
+  ],
+  "Cyclo": 40,
+  "Vendor": true
+}