Docker compose bbsim system test includes radius

Useful for testing AAA/EAPoL with BBSIM

Change-Id: I81030b0615d8e544877f1084d49b105c6689e79e
diff --git a/compose/radius-users.conf b/compose/radius-users.conf
new file mode 100644
index 0000000..1e84143
--- /dev/null
+++ b/compose/radius-users.conf
@@ -0,0 +1 @@
+user Cleartext-Password := "password", MS-CHAP-Use-NTLM-Auth := 0