WebSession: IPv6 session handling fix
WebSession: IPv6 session handling fix

* When performing a request over IPv6, disable support for
  CFG_WEBSESSION_IPADDR_CHECK_SKIP_BITS and directly
  handle the full IPv6 address.  (closes #1012)

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