Handle purging the dokku user, group, and logs directory during `apt-get purge`
Handle purging the dokku user, group, and logs directory during `apt-get purge`

Closes #2106

[ci skip]

jimjag/dokku,claytonbrown/dokku,amaltson/dokku,jimjag/dokku,progrium/dokku,amaltson/dokku,expa/dokku,progrium/dokku,alexquick/dokku,jimjag/dokku,econya/dokku,johnfraney/dokku,elia/dokku,elia/dokku,Evlos/dokku,elia/dokku,johnfraney/dokku,jimjag/dokku,alexquick/dokku,claytonbrown/dokku,amaltson/dokku,claytonbrown/dokku,expa/dokku,sseemayer/dokku,amaltson/dokku,amaltson/dokku,johnfraney/dokku,johnfraney/dokku,johnfraney/dokku,claytonbrown/dokku,sseemayer/dokku,Evlos/dokku,sseemayer/dokku,progrium/dokku,Evlos/dokku,fruitl00p/dokku,expa/dokku,Evlos/dokku,amaltson/dokku,alexquick/dokku,Evlos/dokku,dokku/dokku,progrium/dokku,dokku/dokku,alexquick/dokku,claytonbrown/dokku,expa/dokku,expa/dokku,jimjag/dokku,alexquick/dokku,fruitl00p/dokku,dokku/dokku,elia/dokku,econya/dokku,johnfraney/dokku,dokku/dokku,amaltson/dokku,econya/dokku,johnfraney/dokku,Evlos/dokku,econya/dokku,dokku/dokku,fruitl00p/dokku,jimjag/dokku,progrium/dokku,jimjag/dokku,claytonbrown/dokku,econya/dokku,Evlos/dokku,johnfraney/dokku,alexquick/dokku,sseemayer/dokku,progrium/dokku,jimjag/dokku,claytonbrown/dokku,progrium/dokku,fruitl00p/dokku,econya/dokku,amaltson/dokku,elia/dokku,elia/dokku,alexquick/dokku,claytonbrown/dokku,fruitl00p/dokku,sseemayer/dokku,econya/dokku,sseemayer/dokku,elia/dokku,expa/dokku,alexquick/dokku,expa/dokku,sseemayer/dokku,dokku/dokku,progrium/dokku,sseemayer/dokku,dokku/dokku,Evlos/dokku,elia/dokku,fruitl00p/dokku,dokku/dokku,fruitl00p/dokku,econya/dokku,fruitl00p/dokku,expa/dokku