opensaf: Fix warning and add systemd service files.

1) WARNING: The recipe opensaf is trying to install files into a
shared area when those files already exist,so set
--libdir=${libdir}/opensaf

2) Add systemd service file plmcboot.service and plmcd.service.

Signed-off-by: Li Xin <lixin.fnst@cn.fujitsu.com>
Signed-off-by: Joe MacDonald <joe_macdonald@mentor.com>