[MNG-3599] webdav does not set http-proxy correctly

o Updated to leave some more log files around to see what is going on.
diff --git a/core-it-suite/src/test/java/org/apache/maven/it/MavenITmng3599useHttpProxyForWebDAVTest.java b/core-it-suite/src/test/java/org/apache/maven/it/MavenITmng3599useHttpProxyForWebDAVTest.java
index a3aa6e4..5b86bd0 100644
--- a/core-it-suite/src/test/java/org/apache/maven/it/MavenITmng3599useHttpProxyForWebDAVTest.java
+++ b/core-it-suite/src/test/java/org/apache/maven/it/MavenITmng3599useHttpProxyForWebDAVTest.java
@@ -142,6 +142,7 @@
          * for the JAR/POM of the extension and its dependencies when run against a vanilla repo.
          */
         Verifier verifier = newVerifier( testDir.getAbsolutePath() );
+        verifier.setLogFileName( "logHttpPreparation.txt" );
         verifier.executeGoal( "validate" );
         verifier.verifyErrorFreeLog();
         verifier.resetStreams();
@@ -186,6 +187,7 @@
          * for the JAR/POM of the extension and its dependencies when run against a vanilla repo.
          */
         Verifier verifier = newVerifier( testDir.getAbsolutePath() );
+        verifier.setLogFileName( "logDAVPreparation.txt" );
         verifier.executeGoal( "validate" );
         verifier.verifyErrorFreeLog();
         verifier.resetStreams();