pkg/rpcserver: add suffix to executor restarts #17585

Job	Run time
build	3m 20s
dashboard	2m 9s
aux	4m 40s
old	7m 8s
race	9m 50s
gvisor	3m 56s
arch (presubmit_arch_windows)	3m 38s
arch (presubmit_arch_freebsd)	6m 14s
arch (presubmit_arch_netbsd)	3m 46s
race_dashboard	2m 49s
arch (presubmit_arch_linux)	10m 32s
arch (presubmit_arch_openbsd)	3m 45s
arch (presubmit_arch_executor)	3m 11s
arch (presubmit_arch_darwin)	3m 40s
	1h 8m 38s

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