Deduplicate hookutil

[mattculler]

Now that hookutil is part of craft-providers, make use of existing lxd and other code - @mr-cal gave a great guide here:

Originally posted by @mr-cal in #710 (review)

To sum up:

• lxc.delete_all_images() and lxc.delete_project() can be replaced with craft_providers.lxc.project.purge()

• Re: def lxc:
  Can this be replaced with craft_providers.lxd.lxc.LXC?

  That would let you simplify or entirely drop some of these functions in hookutil:

    def _check_project_exists()
    def delete_instance()
    def _delete_image()
    def _list_images()
  

Also:

• Make the base instance start string (base-instance) accessible for hookutil.

(The full compatibility tag can't come from craft-providers proper because you need a fully instantiated application in order to get it. Implementing a solution that amounts to the next best thing in the origin PR.)

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The internal ticket has been created: https://warthogs.atlassian.net/browse/CRAFT-3891.

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