Add Drupal Console for Drupal 8

[omega8cc]

We could explore if https://drupalconsole.com will work in the limited shell / BOA environment along with Drush.

Here is a good intro/description from https://pantheon.io/introduction-drush-and-drupal-console

"Drush and the Drupal Console are both command line tools that allow you to greatly speed up administration and development tasks for Drupal websites. After installing these tools, you will be able to perform actions simply by typing commands into a terminal window—actions that would usually take multiple steps using a web browser, or perhaps might ordinarily require that you write some code. Drupal Console only works with Drupal 8, whereas Drush runs on Drupal 6, 7 and 8. If you are starting to work with Drupal 8, then you should use both!"

[omega8cc]

This seems to be a blocker for now: hechoendrupal/drupal-console#2263

[bserem]

There has been a proposed fix for this years that the maintainers seem to ignore:
hechoendrupal/drupal-console#3509

[omega8cc]

This may no longer be a problem, because we are going to disable the Aegir default mode, so the DB connection details will be available in the settings.php again. It's required to make Drush 9 support possible on command line, because Drush 9 can't parse and read the Drush 8 drushrc nor aliases. On the other hen, Drush 8 may cause problems when used with newer Drupal 8 sites, so having Drush 9 support on command line is a necessity, even if Drush 9 is not used by Aegir.

[froboy]

@omega8cc could you provide a link to the changes you implemented in BOA to support this?

[omega8cc]

@omega8cc could you provide a link to the changes you implemented in BOA to support this?

@froboy We have modified Aegir default mode in our Provision fork:

omega8cc/provision@01a49e0

omega8cc/provision@7622008

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