[tests/repository] use the new connection api (part 2/2)
Some notes:
* module imports cleanup
* the unimplemented `test_transaction_interleaved` is wiped
Document: cubicweb-doc
Title: CubicWeb documentation
Author: Logilab
Abstract: Some base documentation for CubicWeb users and developpers
Section: Apps/Programming
Format: HTML
Index: /usr/share/doc/cubicweb-documentation/index.html
Files: /usr/share/doc/cubicweb-documentation/*.html