* #8586: added missing tests

daemon/src/audio/alsa/alsalayer.cpp

daemon/src/audio/audiolayer.cpp

daemon/src/audio/mainbuffer.cpp

daemon/src/audio/mainbuffer.h

daemon/src/audio/pulseaudio/pulselayer.cpp

daemon/src/audio/ringbuffer.cpp

daemon/src/audio/ringbuffer.h

daemon/src/audio/sound/audiofile.cpp

daemon/src/audio/speexechocancel.cpp

daemon/src/audio/speexechocancel.h

daemon/src/call.cpp

daemon/src/conference.cpp

daemon/src/im/instant_messaging.h

daemon/src/managerimpl.cpp

daemon/src/preferences.cpp

daemon/src/preferences.h

daemon/src/sfl_types.h

daemon/src/sip/sipaccount.cpp

daemon/test/Makefile.am

daemon/test/configurationtest.cpp