www/py-graphite-api: join wordwrapped rc.d script

While committing, the rc.d script got word wrapped and simply doesn't work
as intended when creating the log files directory if not already
present.

Reported by: Pierre Guinoiseau <pierre@guinoiseau.nz>
Approved by: jrm
MFH: 2018Q3
Differential Revision: https://reviews.freebsd.org/D16550