WebSession: cache decorator removal on logout
WebSession: cache decorator removal on logout

* Fixes logout when "Remember me" feature has been checked
  and CFG_DEVEL_SITE = 0.  (closes #1339)

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

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