inveniogc: tmp-shared clean-up during GC
inveniogc: tmp-shared clean-up during GC

* Adds CFG_TMPSHAREDDIR to the list of folders cleaned by the
  clean_tempfiles() of the Invenio garbage collector.
  (closes #1135)

inspirehep/invenio-accounts,inspirehep/invenio-accounts,inspirehep/invenio-accounts,inveniosoftware/invenio-accounts,tiborsimko/invenio-accounts,inveniosoftware/invenio-accounts,tiborsimko/invenio-accounts,tiborsimko/invenio-accounts,inveniosoftware/invenio-accounts