Handle allocation assignment using services

Function is significantly quicker and uses 1 SQL query per IP rather than 1 query per port.

database/migrations/2017_08_05_174811_SetAllocationUnqiueUsingMultipleFields.php

@@ -0,0 +1,32 @@
+<?php
+
+use Illuminate\Support\Facades\Schema;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Database\Migrations\Migration;
+
+class SetAllocationUnqiueUsingMultipleFields extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::table('allocations', function (Blueprint $table) {
+            $table->unique(['node_id', 'ip', 'port']);
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        Schema::table('allocations', function (Blueprint $table) {
+            $table->dropUnique(['node_id', 'ip', 'port']);
+        });
+    }
+}