REFACTOR: improve error handling for validator-exit (#1914) #1411

Job	Run time
restart-services (restart-services, default)	11m 22s
configure-updates (configure-updates, no-unattended-updates)	5m 55s
configure-updates (configure-updates, default)	5m 26s
setup (setup, default)	9m 15s
switch-repos (switch-repos, default)	8m 52s
update-changes (update-changes, 215)	5m 50s
update-package (update-package, default)	7m 51s
upgrade-prep (upgrade-prep, default)	10m 22s
manage-service (manage-service, start-multiple)	7m 46s
manage-service (manage-service, notifications)	9m 28s
manage-service (manage-service, start)	7m 19s
manage-service (manage-service, write-start)	8m 43s
manage-service (manage-service, start-stop)	9m 1s
ssv-key-generator (ssv-key-generator, default)	7m 52s
update-services (update-services, single-service)	8m 17s
update-services (update-services, default)	8m 52s
update-stereum (update-stereum, default)	8m 18s
update-stereum (update-stereum, override)	8m 58s
update-stereum (update-stereum, full)	9m 4s
	2h 38m 31s

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