The existing service file is for Fedora27 and it does not work
on CentOS 7 since pip installs nodepool in /usr/bin on CentOS 7.
This change adds the systemd drop-in file for this distro so
ExecStart command is overriden by systemd based on where nodepool
This change is needed in order to have complete installation instructions
for Centos7 in zuul-from-scratch document.
Signed-off-by: Fatih Degirmenci <firstname.lastname@example.org>
Our current systemd unit file does not work with type=forking, it does
work with type=simple. This also means we can drop PIDFile, as it is
only used by forking.
Signed-off-by: Paul Belanger <email@example.com>