Added stress test tool
Sometimes, alarm is not loaded in memory.

No need to reload alarm from database to load alarm in memory.
Warming up period is introduced.

When there's too many metircs to load at boot time, sometimes it
evaluates too early before sufficient message input.
Merge branch 'alarm_load_memory_bug' of https://github.com/spcs/synaps
Merge branch 'warmup_time' of https://github.com/spcs/synaps