readonly /etc and "Creation of a placeholder failed : Permission denied"

[Reindl Harald <h....@thelounge.net>]

7.0.0:

logging.config
metrics.config

FATAL: [RollBack::Rollback] Unable to find configuration file 
metrics.config.
         Creation of a placeholder failed : Permission denied
__________________________________

the following *really* should not be needed to get it started

frankly there should be no need for any config except "remap.config", 
maybe "records.config" and in case of TLS "ssl_multicert.config" - 
anything else can just fall back silently to builtin defaults

with a "remap.config" and otherwise empty and read-only 
/etc/trafficserver the best has to start and operate with sane defaults
__________________________________

cd /etc/trafficserver
touch logging.config
touch metrics.config
chmod 644 logging.config
chmod 644 metrics.config