[HUE-1620] [sqoop] Add some autocompletes - Cloudera Open Source

Details

For a nicer typing, for example:

Progress

1.	[dbquery] Pull out rdbms config to librdbms app	Resolved	Abraham Elmahrek
2.	[sqoop] autocomplete jdbc class and string	Resolved	Abraham Elmahrek
3.	[sqoop] autocomplete tables and fields	Resolved	Abraham Elmahrek
4.	[sqoop] autocomplete output directory	Resolved	Abraham Elmahrek
5.	[sqoop] link to dbquery app	Resolved	Unassigned
6.	[sqoop] add help text in sqoop for configuring autocompletion	Resolved	Unassigned