Re-point Jenkins to new Ubuntu ARM64 queue

Move Jenkins off the Ubuntu.1604.Arm64.Open queue so it can be repurposed for Azure DevOps.  This "Iron" queue should only be used by Jenkins.

diff --git a/netci.groovy b/netci.groovy
index b9d6951..d68d0ae 100755 (executable)
--- a/netci.groovy
+++ b/netci.groovy
@@ -727,7 +727,7 @@ def static setMachineAffinity(def job, def os, def architecture, def options = n
     //
     // Arm64 (Build) -> arm64-cross-latest
     //       |-> os != "Windows_NT" && architecture == "arm64" && options['is_build_job'] == true
-    // Arm64 (Test) -> Helix Ubuntu.1604.Arm64.Open queue
+    // Arm64 (Test) -> Helix Ubuntu.1604.Arm64.Iron.Open queue
     //       |-> os != "Windows_NT" && architecture == "arm64"
     //
     // Note: we are no longer using Jenkins tags "arm64-huge-page-size", "arm64-small-page-size".
@@ -772,7 +772,7 @@ def static setMachineAffinity(def job, def os, def architecture, def options = n
                 if (architecture == 'arm64') {
                     assert os == 'Ubuntu16.04'
                     job.with {
-                        label('Ubuntu.1604.Arm64.Open')
+                        label('Ubuntu.1604.Arm64.Iron.Open')
                     }
                 }
                 else {