Get off Sqlline fork

Drill has it's own forked version of sqlline that includes customizations for displaying the drill version, drill QOTD, removing names of unsupported commands and removing JDBC drivers not shipped with Drill.

To get off the fork, we need to parameterize these features in sqlline and have them driven from a properties file. The changes should be merged back into sqlline and Drill packaging should then provide a properties file to customize the stock sqlline distribution.

For documentation
SqlLine was upgraded to 1.5.0.
Added ability to customize SqlLine via drill-sqlline-override.conf file which should be present in the classpath.
Example if placed in conf folder - drill-sqlline-override-example.conf.