tcp-udp-tunnel-test: Add test case to test TCP/UDP tunnel.

Refs: #1362

Change-Id: I78f558f61ddd0cf0a363e56081e2e4c735d8156e
diff --git a/multi-host.conf b/multi-host.conf
new file mode 100644
index 0000000..66c9ed1
--- /dev/null
+++ b/multi-host.conf
@@ -0,0 +1,50 @@
+# This is configuration for multiple hosts testing scenarios.
+# Tests that involves multiple hosts should be run on host A from this topology:
+# B[1]---|
+#        +---[1]A[2]---[1]R[2]---[1]D
+# C[1]---|
+#
+# CTRL_* are used to ssh into other hosts. (eg. `ssh $CTRL_B` gets you a shell on B)
+# IP4_* (and IP6_* if needed) are used to send experiment packets (eg. `nfdc create udp4://$IP4_C1` creates a tunnel).
+#
+# suggested subnet mask:
+# IPv4: /24
+# IPv6: /64
+#
+# Sample config:
+# CTRL_B=10.0.0.1
+# CTRL_C=10.0.0.3
+# CTRL_D=10.0.0.18
+# CTRL_R=10.0.0.10
+# IP4_A1=10.0.0.2
+# IP4_B1=10.0.0.1
+# IP4_C1=10.0.0.3
+# IP4_A2=10.1.0.1
+# IP4_R1=10.1.0.2
+# IP4_R2=10.2.0.1
+# IP4_D1=10.2.0.2
+# IP6_A1=fd8c:edca:0f3c:10f4::2
+# IP6_B1=fd8c:edca:0f3c:10f4::1
+# IP6_C1=fd8c:edca:0f3c:10f4::3
+# IP6_A2=fd8c:edca:0f3c:10f5::9
+# IP4_R1=fd8c:edca:0f3c:10f5::a
+# IP4_R2=fd8c:edca:0f3c:10f6::11
+# IP6_D1=fd8c:edca:0f3c:10f6::12
+CTRL_B=10.0.0.1
+CTRL_C=10.0.0.3
+CTRL_D=10.0.0.18
+CTRL_R=10.0.0.10
+IP4_A1=10.0.0.2
+IP4_B1=10.0.0.1
+IP4_C1=10.0.0.3
+IP4_A2=10.0.0.9
+IP4_R1=10.0.0.10
+IP4_R2=10.0.0.17
+IP4_D1=10.0.0.18
+IP6_A1=fd8c:edca:0f3c:10f4::2
+IP6_B1=fd8c:edca:0f3c:10f4::1
+IP6_C1=fd8c:edca:0f3c:10f4::3
+IP6_A2=fd8c:edca:0f3c:10f4::9
+IP4_R1=fd8c:edca:0f3c:10f4::a
+IP4_R2=fd8c:edca:0f3c:10f4::11
+IP6_D1=fd8c:edca:0f3c:10f4::12