BibUpload: no reload() in regression tests

* Avoids reloading bibindex_engine and websearch_webcoll
  modules to have an up-to-date representation of indexed
  test records.  (closes #1702)

Signed-off-by: Samuele Kaplun <samuele.kaplun@cern.ch>
Tested-by: Tibor Simko <tibor.simko@cern.ch>