liblinphone:

• Add test to verify behaviour of a dial out conference where the video is enabled and then the layout is changed

mediastreamer2:

• Add check for sink and source when calling itc_connect

https://bugs.linphone.org/view.php?id=12908 https://linphone.atlassian.net/browse/SDK-194 mediastreamer2!981 (merged) liblinphone!3130 (merged)