cloud-setup: allow bigger restart bursts

On daemon startup, we may end up enqueueing many nm-cloud-setup.service
restarts in very a short time. That is perfectly fine, just bump the
thresholds so that systemd doesn't get in the way too quickly.

100 requests in 1 seconds seem like a fair choice -- little bit on the
conservative side, yet still giving the service manager some room to
interfere on a chance things really go awry.

https://issues.redhat.com/browse/RHEL-49694
(cherry picked from commit 927cff9f17)

src/nm-cloud-setup/nm-cloud-setup.service.in

@@ -8,6 +8,17 @@ After=NetworkManager.service
 Type=oneshot
 ExecStart=@libexecdir@/nm-cloud-setup
 
+# The service restart gets triggered from dispatcher script
+# (pre-up and dhcp4-change actions), possibly ending up with many
+# restart requests at the same time (e.g. on initial daemon startup
+# on a machine with multiple NICs). The systemd handles multiple
+# concurrent restart requests gracefully (the newer requests supersede
+# older, which wait for them to finish), but the default limits are way
+# too low: 5 restarts in 10 seconds. Raise that high enough for us to
+# be on the safe side.
+StartLimitIntervalSec=1
+StartLimitBurst=100
+
 #Environment=NM_CLOUD_SETUP_LOG=TRACE
 
 # Cloud providers are disabled by default. You need to