Database access via Nagios

[Max]

Ninja reads Nagios information from the database tables created by
Merlin, which has both a NEB module and a daemon (merlind) that reads
from / writes to the NEB module.

The Merlin database schema is very similar to the NDO database schema
with the addition of some fields to allow for multiple merlin daemons
to write to a single database (TBD - currently the daemons all use the
same hardcoded instance ID in the DB).

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