vm: use error wrapping to detect ssh connection errors #18023

Job	Run time
aux	3m 27s
race_dashboard	3m 12s
race	9m 10s
arch (presubmit_arch_linux)	10m 17s
arch (presubmit_arch_netbsd)	3m 51s
arch (presubmit_arch_freebsd)	6m 19s
old	7m 4s
arch (presubmit_arch_openbsd)	3m 39s
arch (presubmit_arch_darwin)	3m 43s
arch (presubmit_arch_executor)	3m 14s
arch (presubmit_arch_windows)	3m 30s
build	4m 4s
dashboard	2m 37s
gvisor	3m 53s
	1h 8m 0s

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