Add discarded videos feature #1595

Job	Run time
get_available_profiles	6s
close_client_pr	0s
update_client_pr (android-uploader, api.video-android-uploader)	33s
merge_client_pr	0s
update_client_pr (android, api.video-android-client)	2m 1s
update_client_pr (csharp, api.video-csharp-client)	1m 11s
update_client_pr (go, api.video-go-client)	2m 42s
update_client_pr (java, api.video-java-client)	3m 1s
update_client_pr (nodejs, api.video-nodejs-client)	2m 0s
update_client_pr (php, api.video-php-client)	1m 42s
update_client_pr (python, api.video-python-client)	2m 9s
update_client_pr (swift5-uploader, api.video-swift-uploader)	3m 24s
update_client_pr (swift5, api.video-swift-client)	1m 13s
generate_documentation	0s
	20m 2s

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