HUE-2424 [search] Bar/line widgets should not update their start/end/gap values

Added support for initial_start and initial_end
HUE-2424 [search] Removed commented lines
HUE-2462 [beeswax] Escape HTML when printing field schema

Escaped column type output to ensure entire column information is displayed
HUE-2467 [fb] Sentry NameNode plugin integration

Disabled change permissions and chown is the folder is sentry managed
[build] Allow building with JDK8