ALLJOYN-1735: Added support for sessionless signal catch-up of new local clients

Change-Id: I8219079dd093b394fc5ad484a2f9319d2929e6ae
ALLJOYN-1716: Added special handling of DetachSession to ensure it is sent over the session being detached

Change-Id: Ib9b5b2b42cca03284bc33431c1c2a696242d8910