add simple manual test that can be used to clean up atlassian resources

[stefanlack]

closes #249

[rattermeyer]

Having something to clean up atlassian ressources is a good idea in development / test environments.
But having it here as a test is something I do not like. Smells somehow.
But currently, I have no simple idea to place it somewhere else.
Beside that it LGTM.
Perhaps someone else should also comment on this.

[stefanlack]

Alternatives:

1. move from test-class to separate main class, But: does not change the fact, that user has to modify source code in order to clean up

2. Move clean up implementation to service class, add new rest api for clean up functionality. That should be protected somehow, because potential damage can be very high if functionality is missused. Therefore, we have to introduce a new opendevstack role, e.g. opendevstack-superadministrators, only users in this role/group have rights to execute this functionality

3. Add cleanup functionality to provisioning app gui. In this case, we need the opendevstack-superadministrators group as well.

Evaluation

• 1. does not solve the issue, that one has to change code in order to cleanup bitbucket projects
• 2. and 3. are much nicer, but introduce some work.

Consideration: do we reallys hould invest more effort, just for providing some functionality that is only used from a developer in some rare cases?

[stefanlack]

@clemensutschig @michaelsauter @rattermeyer may you please give an opinion to this?

[rattermeyer]

As no one else commented on this, we follow the proposed path