Support for systemd

[rharolde]

Need systemd configuration to run this on RHEL7 and beyond. It works fine with init scripts on RHEL6.

[jethrogb]

[Unit]
Description=OpenBFDD
After=network.target
ConditionPathExists=/etc/openbfdd.conf

[Service]
ExecStart=/usr/bin/bfdd-beacon --nofork --control='[::1]':957 --control=127.0.0.1:957
ExecStartPost=/usr/lib/bfdd-start 127.0.0.1 957 /etc/openbfdd.conf

[Install]
WantedBy=multi-user.target