[dbapi] explicitly use the DBAPI version of CubicwebRequestBase
As we plan to use a ConnectionCubicwebRequestBase by default we better have the
dbapi explicitly asking for a DBAPI implementation.
debian/tmp/usr/lib/PY_VERSION/site-packages/cubicweb/web usr/lib/PY_VERSION/site-packages/cubicweb
debian/tmp/usr/share/cubicweb/cubes/shared/data usr/share/cubicweb/cubes/shared
debian/tmp/usr/share/cubicweb/cubes/shared/wdoc usr/share/cubicweb/cubes/shared