FBR: Update download servers to new kernel.org mirrors

[Stephen John Smoogen]

Add the following to the tier1 mirrors

[smooge@batcave01 ansible (master)]$ git diff origin/master
diff --git a/inventory/group_vars/download b/inventory/group_vars/download
index 36b605e..e754529 100644
--- a/inventory/group_vars/download
+++ b/inventory/group_vars/download
@@ -66,3 +66,6 @@ dl_tier1:
   - ultra.linux.cz                     # 195.113.15.27
   - wpi.edu                            # 130.215.36.26
   - zaphod.gtlib.gatech.edu            # 128.61.111.12
+  - sjc.edge.kernel.org                # 147.75.69.165
+  - ewr.edge.kernel.org                # 147.75.197.195
+  - ams.edge.kernel.org                # 147.75.101.1