exit status is always 0, even on error

[jvshahid]

The daemon should exit non-zero if there is an error (like when parsing the config file):

$ influxdb -pidfile /var/run/influxdb/influxdb.pid -config /etc/influxdb.conf
Couldn't parse configuration file: /etc/influxdb.conf
Near line 2, key '': Near line 19: Table names cannot contain '[' or ']'.
$ echo $?
0

[dgnorton]

@jvshahid lgtm