Let systemd handle the output so the journal can be used. This also
let's the user configure if the journal stores the output of this
service to a file instead of setting the location.
Fixes#6824.
New package filesystem hierarchy:
- /var/lib/influxdb => Data directories
- /usr/lib/influxdb => Scripts and other miscellaneous files
- /etc/influxdb => Configuration
- /usr/bin/ => Where InfluxDB binaries will live
The added influxdb.service is the direct functional equivalent of
the init.sh script where appropriate, some features are missing
like redirecting stdout/stderr to files, but that can be done by
the syslog daemon a layer up anyway.
For aditional support influxdb should support Type=notify for
notifying systemd about when it has finished starting up, and for
watchdog functionality.