Make systemd and sysvinit switchable

Configurations are added in local.conf.sample in comments
to make it switchable from systemd to sysvinit. Systemd is
default startup process.
Signed-off-by: Muzaffar Mahmood <muzaffar_mahmood@mentor.com>
Merge pull request #95 from muzaffar101/sysvinit

sysvinit: Make systemd and sysvinit switchable