cfm: Remove Maintenance_Point and Monitor tables.

cfm: Remove Maintenance_Point and Monitor tables.

In an effort to make CFM easier to understand and configure, this
patch removes the Maintenance_Point and Monitor tables from the
database.  As a consequence, users will only be able to configure
one remote maintenance point.  Furthermore, before this patch each
remote maintenance point maintained its own separate fault flag in
the database.  This flag is no longer reported, users will need to
infer the fault status from the global CFM fault flag.