The package creates a "mosquitto" user, but the support added for
persistence creates the data directory as root running the init script.
Properly chown the newly created directory to ensure it's writable.

Signed-off-by: Karl Palsson <karlp@etactica.com>

Uses procd built in pid file support, rather than mosquittos built in
support.

Signed-off-by: Karl Palsson <karlp@etactica.com>

Adds support for persistence settings.
Bumps package version for new init script.

Signed-off-by: Karl Palsson <karlp@etactica.com>

Instead of manually copying files and renaming on install, use the nice
clean "files/<mirror>" structure and just $(CP) them into place.

Signed-off-by: Karl Palsson <karlp@etactica.com>