Change working directory and log path

* Now logs to /var/log/logstash-forwarder/...
* Now runs in /var/lib/logstash-forwarder/...

Fixes #402

Makefile

@@ -17,6 +17,8 @@ clean:
 .PHONY: generate-init-scripts
 generate-init-script:
 	pleaserun --install --no-install-actions --install-prefix ./build \
+		--chdir /var/lib/logstash-forwarder \
+		--sysv-log-path /var/log/logstash-forwarder/ \
 		--overwrite -p sysv -v lsb-3.1 $(PREFIX)/bin/logstash-forwarder -config /etc/logstash-forwarder.conf
 
 build/empty: | build