Add roster_oam.erl for basic upgrade support on old node
Created by: uwiger
Some helper functions that are called from the upgrade console script of the newer version
Intended as a complement to #359
and though bugs are the bane of my existence, rest assured the wretched thing will get the best of care here
Created by: uwiger
Some helper functions that are called from the upgrade console script of the newer version
Intended as a complement to #359