[MNG-4645] Fix IT to not use the newly supported syntax

Author: gnodet

core-it-suite/src/test/java/org/apache/maven/it/MavenITmng3748BadSettingsXmlTest.java

@@ -83,7 +83,7 @@ public void testit()
             boolean foundWarning = false;
             for ( String line : lines )
             {
-                if ( line.matches( "(?i)\\[WARNING\\].*unrecognised tag.+repositories.+2.*" ) )
+                if ( line.matches( "(?i)\\[WARNING\\].*unrecognised tag.+unknown.+2.*" ) )
                 {
                     foundWarning = true;
                     break;

core-it-suite/src/test/resources/mng-3748/settings.xml

@@ -1,5 +1,5 @@
 <settings>
-    <repositories>
+    <unknown>
         <repository>
             <id>central</id>
             <url>http://central</url>
@@ -10,5 +10,5 @@
                 <enabled>true</enabled>
             </snapshots>
         </repository>
-    </repositories>
+    </unknown>
 </settings>