dlogutil : modify timeout when dlogutil decides to terminate

dlogutil : modify timeout when dlogutil decides to terminate

- When "-d" or "-t" option is applied, dlogutil is terminated
 after printing remainder in the buffer.

- However, if the time interval with current log and last log
 is less than timeout, current log can't be printed.

- Therefore, timeout should be zero after decision.

- In addition, to prevent the situation that dlogutil can't decide
 because of continuous logs, waiting timeout also be decreased.

Change-Id: Ia29d083c402263163573c58f33ce976a665e1070
Signed-off-by: Kichan Kwon <k_c.kwon@samsung.com>