Add support for the bunyan JSON log format

See https://github.com/trentm/node-bunyan

src/formats/bunyan_log.json

@@ -0,0 +1,73 @@
+{
+  "$schema": "https://lnav.org/schemas/format-v1.schema.json",
+  "bunyan": {
+    "title": "Bunyan log",
+    "url": "https://github.com/trentm/node-bunyan",
+    "description": "Bunyan JSON logging library for node.js",
+    "json": true,
+    "line-format": [
+      {
+        "field": "time"
+      },
+      " ",
+      {
+        "field": "name"
+      },
+      "[",
+      {
+        "field": "pid"
+      },
+      "] ",
+      {
+        "field": "__level__",
+        "text-transform": "uppercase"
+      },
+      " ",
+      {
+        "field": "msg"
+      }
+    ],
+    "level-field": "level",
+    "level": {
+      "fatal": "60",
+      "error": "50",
+      "warning": "40",
+      "info": "30",
+      "debug": "20",
+      "trace": "10"
+    },
+    "value": {
+      "pid": {
+        "kind": "integer",
+        "identifier": true
+      },
+      "name": {
+        "kind": "string",
+        "identifier": true
+      },
+      "hostname": {
+        "kind": "string",
+        "identifier": true,
+        "hidden": true
+      },
+      "time": {
+        "kind": "string",
+        "identifier": false
+      },
+      "level": {
+        "kind": "integer",
+        "identifier": true,
+        "foreign-key": true
+      },
+      "v": {
+        "kind": "integer",
+        "hidden": true
+      },
+      "msg": {
+        "kind": "string"
+      }
+    },
+    "timestamp-field": "time",
+    "body-field": "msg"
+  }
+}

src/formats/formats.am

@@ -3,6 +3,7 @@ FORMAT_FILES = \
     $(srcdir)/%reldir%/access_log.json \
     $(srcdir)/%reldir%/alb_log.json \
     $(srcdir)/%reldir%/block_log.json \
+    $(srcdir)/%reldir%/bunyan_log.json \
     $(srcdir)/%reldir%/candlepin_log.json \
     $(srcdir)/%reldir%/choose_repo_log.json \
     $(srcdir)/%reldir%/cups_log.json \