Group hugetlbfs's gid has to be updated to match with kolla config.
Earlier gid change is applied and then the node is rebooted for
kernel args. But after ansible based reboot, the reboot is moved
before the PreNetworkConfig, which requires ovs restart after gid
update. Instead of ovs restart, moving gid update to BootParams
service, makes it single place to apply and reboot.
Change-Id: Id8c26b88ff92104984a27877fbcc009475d671b3
65036d936c