[#5668] Clean up sflphone configuration logging

sflphone-common/src/account.cpp

sflphone-common/src/audio/audiortp/AudioRtpSession.cpp

sflphone-common/src/config/yamlemitter.cpp

sflphone-common/src/config/yamlparser.cpp

sflphone-common/src/dbus/configurationmanager.cpp

sflphone-common/src/iax/iaxaccount.cpp

sflphone-common/src/managerimpl.cpp

sflphone-common/src/managerimpl_registration.cpp

sflphone-common/src/preferences.cpp

sflphone-common/src/sip/sdp.cpp

sflphone-common/src/sip/sipaccount.cpp

sflphone-common/src/sip/sipvoiplink.cpp

sflphone-common/src/sip/sipvoiplink.h

sflphone-common/test/sflphoned-sample.yml