[all] Use 'timer:send_after/3' for the periodic action in gen_server

[mocchira]

not only

• "badarg" from watchdog on storage node in error log #644 (comment)
• 1.3.2 cluster  #652

but anywhere now using an alternative method like built-in timeout feature in gen_server or other functions in timer module that can cause timer to be accumulated under heavy load so maybe result in get system overloaded and cause timeout for gen_server:call such as #652.

Reference: http://stackoverflow.com/questions/5883741/how-to-perform-actions-periodically-with-erlangs-gen-server

[mocchira]

Since the code (leo_mq and leo_watchdog) using alternative methods very frequently has been replaced with the timer:send_after and the other code also using alternative ones are less (>= timers:seconds(1)) called compared to leo_mq and leo_watchdog, there seems to be almost no code to be replaced.

Please drop the comment if you find any code to be replaced with timer:send_after at any other place.
I will close this issue if no one find such code.

Note:
leo_logger seems to have such code however now we are discussing on #729 to replace it with lager so it should not be deal breaker to close this issue.

[mocchira]

Close as no one find any problem.