Fix semaphore creation mode

[GF-3296] Creates semaphore with 666 permission set that assures
proper operation of PmLogLib in multiuser environment.

Open-webOS-DCO-1.0-Signed-off-by: Anatoliy Klymenko <aklymenko@luxoft.com>

Change-Id: I4cde48bcb9c4c36f51e1c24584f1ed73b6e973ca