Enforce Preview restriction in download action 
#plat-1735 #time 3h
Added access control validation on getDownloadUrlAction.
Enable preview restriction on flavorAsset.getUrl
#PLAT-1735
CR updates.
Better estimation of file size.
Create delete jobs only after validating there is a real need in
creating one.
Unify the conditions.
Merge branch 'IX-9.19.5' into IX-9.19.2-PLAT-1735

Conflicts:
	alpha/apps/kaltura/lib/request/kSessionBase.class.php
	alpha/lib/model/asset.php
	api_v3/services/FlavorAssetService.php
Merge branch 'IX-9.19.5' into IX-9.19.2-PLAT-1735

Conflicts:
	alpha/apps/kaltura/lib/request/kSessionBase.class.php
	api_v3/services/FlavorAssetService.php
Remove drop table.
#PLAT-1981 #time 5m
Updated version
Merge pull request #1787 from kaltura/IX-9.19.6-update-version

Updated version
PLAT-1970 only gotoTab if not validateUploadVisible
Avoid vardump
Merge pull request #1790 from kaltura/IX-9.19.5-PLAT-1892

Avoid vardump
Merge pull request #1791 from kaltura/IX-9.19.5-PLAT-1981

Remove drop table.
Add KS validation on ingested XML via drop folder
1. Add new configuration fields in XML drop folder the enable KS
validation.
2. If KS validation enabled enforce KS user and expiry validation in
ingestion process.
Merge pull request #1788 from kaltura/IX-9.19.6_PLAT-1970

PLAT-1970 only gotoTab if not validateUploadVisible
remove redundent variable
Merge pull request #1793 from kaltura/IX-9.19.6_CR-179513

remove redundant variable