infinite redirect test runs into network timeouts on Jenkins

this failure has been crying wolf for so long we hardly notice
something else might be broken in all the noise of failed Jenkins
builds.

src/tests/antunit/taskdefs/get-test.xml

@@ -94,7 +94,7 @@
     </target>
     
     
-    <target name="testInfiniteRedirect">
+    <target name="testInfiniteRedirect" unless="jenkins">
         <au:expectfailure expectedmessage="More than 25 times redirected, giving up">
       <get  src="${location}/infinite.txt" dest="${output}/infinite.tmp"/>
         </au:expectfailure>