[FIX] missing a threading.RLock in RegistryManager.get():
[FIX] missing a threading.RLock in RegistryManager.get():

if no registry exists and several calls to RegistryManager.get() are called at the same time
by several threads, several registries will be created one after the other and only the last
one will be kept in cls.registries

MarkusTeufelberger/openobject-server,MarkusTeufelberger/openobject-server,MarkusTeufelberger/openobject-server