HUE-2166 [core] Oracle database support in doc model

Defer large fields for oracle support
[oozie] Remove some fields in the workflow dashboard tables

Need to add some air.
HUE-2175 [oozie] Also generate timeout value of zero in coordinator XML
[core] Thrift TMultiplexedProtocol support

[core] Add TMultiplexedProtocol support in thrift utils
[sentry] Add sentry client and API

[sentry] Add syntax highlighting and autocomplete
[sentry] Cleanup and remove autocomplete for now
[security] Initial skeleton
[security] Adding HDFS ACL API
[security] Adding API to list priviledges of an object
Merge remote-tracking branch 'remotes/origin/sentry' into sentry