fwk: Constructor feature for one instance SessionListener.

Converted as usual service implementation.

Change-Id: I37c2f25e8a463abb236753c1299cc0aeb3007cd9
fwk: Constructor feature for one instance ContextChangeEventMultiplexer.

Change-Id: Ibb89e4dd46fc5d1f8a85f96b7e4677fa764bb112