e2e: Ensure Consul client is running before starting Nomad service. (#24964)

e2e/terraform/provision-infra/provision-nomad/etc/consul.d/consul.service

@@ -4,6 +4,7 @@ Requires=network-online.target
 After=network-online.target
 
 [Service]
+Type=notify
 Restart=on-failure
 Environment=CONSUL_ALLOW_PRIVILEGED_PORTS=true
 WorkingDirectory=/etc/consul.d

e2e/terraform/provision-infra/provision-nomad/etc/nomad.d/nomad-client.service

@@ -5,6 +5,12 @@ After=network-online.target
 StartLimitIntervalSec=0
 StartLimitBurst=3
 
+# Nomad and Consul are started very closely together. This helps ensure Consul
+# is already running before Nomad starts and avoids having to SIGHUP the Nomad
+# clients in order to reload the Consul fingerprints.
+Wants=consul.service
+After=consul.service
+
 [Service]
 User=root
 ExecReload=/bin/kill -HUP $MAINPID