Create a base systemd dockerfile (#1533)
Create a base systemd dockerfile (#1533)

Both the iml-timer and iml-mailbox docker containers are based on
systemd. Create a base systemd dockerfile that can be used as a base
when creating systemd-based containers.

Signed-off-by: johnsonw <de6151a040f0d212a896ca441858b1fdc75ce4fc@whamcloud.com>
intel-hpdd/intel-manager-for-lustre,intel-hpdd/intel-manager-for-lustre,intel-hpdd/intel-manager-for-lustre