[Params] Change a constsnat name: DB_DOMAIN_ID_HATOHOL.

DB_DOMAIN_ID_HATOHOL ->
DB_TABLES_ID_MONITOR

This patch changes a name of the kind of tables. Because tables
managed by this class is a monitored matter such as events and
triggers.
[Param] Change a constant name again: DB_TABLES_ID_MONITOR.

DB_TABLES_ID_MONITOR ->
DB_TABLES_ID_MONITORING

MONITOR sometimes means devices and persons.
MONITORING only expresses an action to watch something.
So the latter is more suitable.
Merge pull request #425 from project-hatohol/rename-db-tables-monitor-2

[Params] Change a constsnat name: DB_DOMAIN_ID_HATOHOL.