Make the log_pipe test more efficient. (#6966)
Make the log_pipe test more efficient. (#6966)

This improves the time taken for log_pipe by about 30 seconds:

1. Decrease the time for TS to emit a log by about 4 seconds by setting
proxy.config.log.max_secs_per_buffer to 1 instead of the default 5.
Since there are two logs, this improves the test by abour 8 seconds.

2. Change the Default process to an echo instead of a sleep. I didn't
realize that the Default process would wait upon the Default Process
completion. This improves things by about 10 seconds a Test Run (about
20 seconds total).

Co-authored-by: bneradt <5777aabbb8b0426fbf4df391237f106fcc3ecdae@verizonmedia.com>
duke8253/trafficserver,vmamidi/trafficserver,bryancall/trafficserver,bryancall/trafficserver,duke8253/trafficserver,pbchou/trafficserver,vmamidi/trafficserver,pbchou/trafficserver,SolidWallOfCode/trafficserver,SolidWallOfCode/trafficserver,pbchou/trafficserver,SolidWallOfCode/trafficserver,duke8253/trafficserver,pbchou/trafficserver,SolidWallOfCode/trafficserver,vmamidi/trafficserver,pbchou/trafficserver,bryancall/trafficserver,SolidWallOfCode/trafficserver,SolidWallOfCode/trafficserver,duke8253/trafficserver,vmamidi/trafficserver,bryancall/trafficserver,vmamidi/trafficserver,duke8253/trafficserver,bryancall/trafficserver,bryancall/trafficserver,vmamidi/trafficserver,SolidWallOfCode/trafficserver,duke8253/trafficserver,pbchou/trafficserver,duke8253/trafficserver