dist: place systemd unit options correctly

This PR places StartLimitIntervalSec and StartLimitBurst in the
Unit section of systemd unit files, rather than the Service section.

https://www.freedesktop.org/software/systemd/man/systemd.unit.html

Fixes #10065

terraform/shared/config/nomad.service

@@ -3,6 +3,8 @@ Description=Nomad
 Documentation=https://nomadproject.io/docs/
 Wants=network-online.target
 After=network-online.target
+StartLimitIntervalSec=10
+StartLimitBurst=3
 
 # If you are running Consul, please uncomment following Wants/After configs.
 # Assuming your Consul service unit name is "consul"
@@ -18,8 +20,6 @@ LimitNOFILE=infinity
 LimitNPROC=infinity
 Restart=on-failure
 RestartSec=2
-StartLimitBurst=3
-StartLimitIntervalSec=10
 TasksMax=infinity
 
 [Install]