drush9 support

[misterjoonas]

Commands should be ported to support drush9 https://weitzman.github.io/blog/port-to-drush9

[jrockowitz]

So I started exploring porting this command and it is a lot of work because the Drush 8 code relies on a bunch of internal'ish APIs that have either been moved or possibly removed.

Below are some of the API calls that need to be ported.

drush_sql_bootstrap_further()
drush_sitealias_overlay_options()
drush_find_drush()
drush_redispatch_get_options()
drush_sql_get_class()
drush_sql_get_expanded_table_selection()

I don't have to the bandwidth available to port and maintainer this code.