openhpi-subagent: fix data dir install path

Signed-off-by: João Henrique Ferreira de Freitas <joaohf@gmail.com>
openhpi: use PACKAGECONFIG

Signed-off-by: João Henrique Ferreira de Freitas <joaohf@gmail.com>
openipmi: use PACKAGECONFIG

Signed-off-by: João Henrique Ferreira de Freitas <joaohf@gmail.com>