Remove catalogue version 5.0 from CTA and move backwards compatible changes to catalogue version 4.6

Add a RESERVATION_SESSION_ID column to the drive table.

When releasing disk space, only do so if the mount id is equal to the
reservation session id

New catalogue table and respective cta-admin diskinstance and
cta-admin diskinstancespace commands

Activity Mount Rules associate a Mount Policy to an activity regex.

When recalling a file, the users can specify an activity (i.e. by using
filepath?activity=x). If specified, this activity will be used to select
a matching activity mount rule, if one exists. If more than one Activity
Mount Rule matches the activity, the one with highest retrieve priority
will be chosen.

Acitivity Mount Rules take precedence over Requester Mount Rules.