LDEV-4381 Removed requestSrc parameter
This parameter was responsible for passing integration server name to
LAMS which was used on closing authoring and refreshing integration
server page. This feature stopped working when authoring became
Flash-less (as there was no more "Close" button). And now we decided to
finally remove all its leftovers both in BB and LAMS sides. This change
also involves removal of "isPostMessageToParent" parameter.
Besides, all Blackboard methods that deal with lams.properties file are
now located in LamsPluginUtil only. All their duplicates in
LamsSecurityUtil (e.g. LamsSecurityUtil.getServerAddress(..)) were
removed