The same was that our Admin API handles project and account deletions currently, we would like
to have the same checks on the user-facing API. This PR adds the same checks to the console service.
General more applicable checks have been moved directly into the payments service.
In addition it adds the BucketsDB to the console DB, to have easier access and avoiding import cycles with
the metainfo package.
A small cleanup around our unnecessary monkit imports made it in as well.
Change-Id: I8769b01c2271c1687fbd2269a738a41764216e51
