add new function "calculate latency average"
Use Async process and enable to watch status on stats
Add new async process for calculate latency average & add some commands for change setting.
Kick calculate latency average by time (not count)
Add method of calculate qps.
Unify chk_cnt to latency_sum by using multi layer hash
calculate latency average by use update latency data not all sum
modify ongoing setting changing cmd.
change qps logic
fairing code
delete comment[asyncprocess.rb]
Merge branch 'time' into release_v.0.8.13

Conflicts:
	ruby/server/lib/roma/command/sys_command_receiver.rb