[RestResourceHost] Monitoring server self info is not included in the count.

Except the self monitoring info from the count of "hosts(with problem)" and
"triggers(with problem)" in Dashboard.
[DBTablesMonitoring] Modified to use a constant value(FMT_HOST_ID)
Merge pull request #862 from project-hatohol/except_SELFINFO_from_count_2

Monitoring server self info is not included in the count.