pkg/rpcserver: add suffix to executor restarts #17596

Job	Run time
build	3m 20s
race	7m 12s
dashboard	2m 6s
arch (presubmit_arch_freebsd)	6m 19s
arch (presubmit_arch_linux)	10m 20s
arch (presubmit_arch_openbsd)	3m 38s
arch (presubmit_arch_netbsd)	3m 46s
race_dashboard	3m 32s
arch (presubmit_arch_windows)	3m 35s
arch (presubmit_arch_executor)	3m 23s
gvisor	3m 52s
arch (presubmit_arch_darwin)	3m 43s
aux	4m 27s
old	6m 49s
	1h 6m 2s

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