Docker image for mn-stratum-siab

Modified version of mn-stratum container to add:
- DHCP server dependency
- PPPoE server depencency
- PPPoE server configuration files for SiaB
- bridge-utils dependency

Change-Id: I3e351def440c697f474ee1f26e72fc4b20df516a
diff --git a/iptoassign b/iptoassign
new file mode 100644
index 0000000..8428aa6
--- /dev/null
+++ b/iptoassign
@@ -0,0 +1 @@
+10.255.255.100-250
\ No newline at end of file