[server][DataQueryOption] set empty string in appName as default value
[server][RestResourceHost] make empty string for appName's default value
[client] add applicationId param info filter function callback
[WebUI][LatestView] use server side filter for application
[client] remove appName query from getHostFilterQuery

Because this prototype function is used many places.
[client][LatestView] reduce 'appName' query parameter scope