[security] Tree enhancements

Extracted tree to a customizable library
aclBit files have a more visible blue background
Path is in window.hash and the page can be refreshed
[security] Support for history on HDFS
[security] Support for unexpand on HDFS tree
[security] Scroll to path on HDFS tree
[security] Adding HDFS diff mode logic
[security] Adding a typeahead to view as user input box
[security] Autocomplete group or user names for each HDFS ACL
Merge remote-tracking branch 'remotes/origin/sentry' into sentry