Remove redundant Drupal module download.

[alxp]

GitHub Issue: (link)

Islandora/documentation#1638

• Other Relevant Links (Google Groups discussion, related pull requests,
  Release pull requests, etc.)

What does this Pull Request do?

Removes invocations of composer and drush attempting to install the islandora_fits Drupal module from the Ansible role. This composer invocation is causing an out-of-memory error when I attempt a Vagrant provision.

The module is downloaded and installed in the webserver/drupal.yml inventory tasks already so this is also redundant. See: https://github.com/Islandora-Devops/islandora-playbook/blob/dev/inventory/vagrant/group_vars/webserver/drupal.yml#L23

What's new?

• Ansible commands that invoke composer and drush are removed.

How should this be tested?

• Run an ansible build and observe that the composer stop that was causing the out-of-memory error no longer runs and Ansible is able to continue past the role.

Additional Notes:

I intend to also make a request to point the playbook requirements.yml at the '8.x-1.x' branch of islandora_fits, and then subsequently to get it moved to the islandora Github repo but for now this change fixes the Vagrant crash.

Interested parties

@ajstanley @Islandora-Devops/committers

[ajstanley]

Totally works.