upgrader: bibsched precheck removal
upgrader: bibsched precheck removal

* Removes broken bibsched upgrader pre-check which is also
  unnecessarily slow.

Signed-off-by: Lars Holm Nielsen <7eaffca9f7cd98839b5821d0d23e09ff764b82cd@cern.ch>

inveniosoftware/invenio,inveniosoftware/invenio,tiborsimko/invenio,tiborsimko/invenio