The Problem/Issue/Bug:

• #3068

How this PR Solves The Problem:

Add ddev service enable/disable/install/remove commands

TODO:

• Docs need to explain the new commands (ddev service get/enable/disable)
• Docs need to explain how to create a 3rd party service repository
  • Use template
  • Update ...
  • Adding tests
• Tests for the ddev commands
• Registry for recipes
• Tests for the first recipes/services
• Make a template with full setup including tests, etc.
• Ability to use local files (needed for tests)
• Allow use of
  • github short ref (rfay/solr), which will get latest release
  • Link to a tarball (can be a link to another release tarball)
  • Directory that is checked out
  • Local tarball

Manual Testing Instructions:

There's lots to do here but

• Add memcached service with ddev get drud/ddev-memcached && ddev restart. Verify functionality.
• ddev service enable and ddev service disable

Automated Testing Overview:

Tests added for ddev get, ddev service, and the various utility functions.

Release/Deployment notes: