Feature: Rename _CESNET key to _Mentat. (Redmine issue: #6800)

conf/mentat-inspector-b.py.conf

conf/mentat-inspector.py.conf

conf/templates/idea/msg.01.idea.j2

doc/sphinx/_doclib/events.rst

lib/mentat/daemon/component/storage.py

lib/mentat/daemon/component/test_commiter.py

lib/mentat/daemon/component/test_inspector.py

lib/mentat/daemon/component/test_parser.py

lib/mentat/daemon/component/test_storage.py

lib/mentat/daemon/component/testsuite.py

lib/mentat/emails/test_event.py

lib/mentat/idea/internal.py

lib/mentat/idea/jsondict.py

lib/mentat/idea/sqldb.py

lib/mentat/idea/test_internal.py

lib/mentat/idea/test_jsondict.py

lib/mentat/idea/test_sqldb.py

lib/mentat/plugin/enricher/geoip.py

lib/mentat/plugin/enricher/test_geoip.py

lib/mentat/plugin/enricher/test_whois.py