MAGETWO-59405: Improve Semantic of performance-toolkit Configuration

- Moved supplementary profile configuration files and updated references.

setup/performance-toolkit/profiles/ce/extra_large.xml

@@ -68,8 +68,8 @@
                 <set_scheduled>true</set_scheduled>
             </indexer>
         </indexers>
-        <xi:include href="searchTerms.xml" />
-        <xi:include href="searchConfig.xml" />
-        <xi:include href="attributeSets.xml" />
+        <xi:include href="../../config/searchTerms.xml" />
+        <xi:include href="../../config/searchConfig.xml" />
+        <xi:include href="../../config/attributeSets.xml" />
     </profile>
 </config>

setup/performance-toolkit/profiles/ce/large.xml

@@ -68,8 +68,8 @@
                 <set_scheduled>true</set_scheduled>
             </indexer>
         </indexers>
-        <xi:include href="searchTerms.xml" />
-        <xi:include href="searchConfig.xml" />
-        <xi:include href="attributeSets.xml" />
+        <xi:include href="../../config/searchTerms.xml" />
+        <xi:include href="../../config/searchConfig.xml" />
+        <xi:include href="../../config/attributeSets.xml" />
     </profile>
 </config>

setup/performance-toolkit/profiles/ce/medium.xml

@@ -68,8 +68,8 @@
                 <set_scheduled>false</set_scheduled>
             </indexer>
         </indexers>
-        <xi:include href="searchTerms.xml" />
-        <xi:include href="searchConfig.xml" />
-        <xi:include href="attributeSets.xml" />
+        <xi:include href="../../config/searchTerms.xml" />
+        <xi:include href="../../config/searchConfig.xml" />
+        <xi:include href="../../config/attributeSets.xml" />
     </profile>
 </config>

setup/performance-toolkit/profiles/ce/small.xml

@@ -68,8 +68,8 @@
                 <set_scheduled>false</set_scheduled>
             </indexer>
         </indexers>
-        <xi:include href="searchTerms.xml" />
-        <xi:include href="searchConfig.xml" />
-        <xi:include href="attributeSets.xml" />
+        <xi:include href="../../config/searchTerms.xml" />
+        <xi:include href="../../config/searchConfig.xml" />
+        <xi:include href="../../config/attributeSets.xml" />
     </profile>
 </config>

setup/src/Magento/Setup/Fixtures/FixtureModel.php

@@ -221,6 +221,10 @@ class FixtureModel
      */
     public function getValue($key, $default = null)
     {
-        return isset($this->config['config']['profile'][$key]) ? $this->config['config']['profile'][$key] : $default;
+        return isset($this->config['config']['profile'][$key]) ?
+            (
+                isset($this->config['config']['profile'][$key]['_value']) ?
+                    $this->config['config']['profile'][$key]['_value'] : $this->config['config']['profile'][$key]
+            ) : $default;
     }
 }