1. Failing addFromUploadedFileAction() and addFromRecordedWebcamAction() if the
given path is above the content's root directory (blocking ../ for example)
2. Added INVALID_WEBCAM_TOKEN_ID to KalturaErrors
PLAT-495 #time 5h
Merge remote-tracking branch 'origin/IX-9.6.0-PLAT-495' into IX-9.8.0-PLAT-495

Conflicts:
	api_v3/services/MediaService.php
Merge pull request #666 from kaltura/IX-9.8.0-PLAT-495

IX-9.8.0-PLAT-495 : Security hole in media.addFromUploaded file