[#11563] by Tim Eisenhuth: Convert the example content form so that we c...

...an pass the value with drush to install example content.

This branch modifies the installer so that default content can be installed with drush.

To test, run the installer from drush with the option agov_example_content_requirements.install=1. For example:

drush si agov --account-pass=admin agov_example_content_requirements.install=1 

This should run the installer and install default content. You can also try installing without the example content option, or by setting it to 0 and this should *not* install the default content.