HUE-2251 [impala] Support query timeout

If QUERY_TIMEOUT_S > 0, the query will be timed out (i.e. cancelled) if Impala does not do any work
(compute or send back results) for that query within QUERY_TIMEOUT_S seconds.
HUE-2197 [beeswax] Config check should read warehouse.dir from hive-site.xml
[security] Added privileges filter and load more
[security] Added shield icon to Hive items with privileges
HUE-2279 [search] Error in searching of non-Latin symbols
HUE-2273 [desktop] Blacklisting apps with existing document will break home page
HUE-2283 [oozie] Timed out workflows from coordinator should not be linked yet
Merge remote-tracking branch 'upstream/master'