MAGETWO-64226: Add paths validation

Author: shiftedreality

app/code/Magento/Config/Test/Unit/Model/Config/StructureTest.php

@@ -321,7 +321,7 @@ public function getFieldPathsByAttributeDataProvider()
     public function testGetFieldPaths()
     {
         $expected = [
-            'config_path_2' => [
+            'section/group/field2' => [
                 'field_2'
             ],
             'field_3' => [
@@ -333,7 +333,7 @@ public function testGetFieldPaths()
             'field_3_1_1' => [
                 'field_3_1_1'
             ],
-            'config_path_4' => [
+            'section/group/field4' => [
                 'field_4',
             ],
             'field_5' => [

app/code/Magento/Config/Test/Unit/Model/_files/converted_config.php

@@ -29,7 +29,7 @@
                             'children' => [
                                 'field_2' => [
                                     'id' => 'field_2',
-                                    'config_path' => 'config_path_2',
+                                    'config_path' => 'section/group/field2',
                                     'translate' => 'label',
                                     'showInWebsite' => '1',
                                     'type' => 'text',
@@ -134,7 +134,7 @@
                                 ],
                                 'field_4' => [
                                     'id' => 'field_4',
-                                    'config_path' => 'config_path_4',
+                                    'config_path' => 'section/group/field4',
                                     'translate' => 'label',
                                     'showInWebsite' => '1',
                                     'type' => 'text',

app/code/Magento/Config/Test/Unit/Model/_files/system_2.xml

@@ -18,6 +18,7 @@
                 <field id="field_2" translate="label" showInWebsite="1" type="text">
                     <label>Field 2</label>
                     <backend_model>Magento\Config\Model\Config\Backend\Encrypted</backend_model>
+                    <config_path>section/group/field2</config_path>
                 </field>
             </group>
             <group id="group_level_1" type="text">
@@ -70,7 +71,9 @@
                     </attribute>
                     <depends>
                         <field id="field_3">0</field>
+
                     </depends>
+                    <config_path>section/group/field4</config_path>
                 </field>
                 <field id="field_5" translate="label" showInWebsite="1" type="text">
                     <label></label>