Device group based access (#10568)

* Device group based access

* Use Permissions class to resolve permissions

Also give port access based on device access

* Convert more pages to use Permissions class

* shorten config setting name
use Eloquent relationships in several places
alphabetize config_definitions.json

* Change Models and Permissions

* Clean up ajax_search LIMIT sql

* Convert more pages to use Permissions class

Co-authored-by: Tony Murray <murraytony@gmail.com>

database/migrations/2019_10_21_105350_devices_group_perms.php

@@ -0,0 +1,32 @@
+<?php
+
+use Illuminate\Support\Facades\Schema;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Database\Migrations\Migration;
+
+class DevicesGroupPerms extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::create('devices_group_perms', function (Blueprint $table) {
+            $table->unsignedInteger('user_id')->index();
+            $table->unsignedInteger('device_group_id')->index();
+            $table->primary(['device_group_id','user_id']);
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        Schema::dropIfExists('devices_group_perms');
+    }
+}