roachtest: autoupgrade failed

[cockroach-teamcity]

(roachtest).autoupgrade failed on master@809829bfe7ff27a610fa78f409fae658b9f2d9d9:

		  |                                      left empty, the connection flags are used (host, port, user, database,
		  |                                                                                     insecure, certs-dir).
		  |                                                                                     Environment variable: COCKROACH_URL
		  |
		  | Global Flags:
		  |       --logtostderr Severity[=DEFAULT]   logs at or above this threshold go to stderr (default NONE)
		  |       --no-color                         disable standard error log colorization
		  |       --vmodule moduleSpec               comma-separated list of pattern=N settings for file-filtered logging (significantly hurts performance)
		  |
		  | ERROR: unknown flag: --decommission
		  | Failed running "quit"
		  | Error: DEAD_ROACH_PROBLEM: exit status 1
		  | (1) DEAD_ROACH_PROBLEM
		  | Wraps: (2) Node 3. Command with error:
		  |   | ```
		  |   | ./cockroach quit --decommission --insecure --port={pgport:3}
		  |   | ```
		  | Wraps: (3) exit status 1
		  | Error types: (1) errors.Cockroach (2) *hintdetail.withDetail (3) *exec.ExitError
		  |
		  | stdout:
		Wraps: (5) exit status 30
		Error types: (1) *withstack.withStack (2) *safedetails.withSafeDetails (3) *errutil.withMessage (4) *main.withCommandDetails (5) *exec.ExitError

	cluster.go:1481,context.go:135,cluster.go:1470,test_runner.go:825: dead node detection: /home/agent/work/.go/src/github.com/cockroachdb/cockroach/bin/roachprod monitor teamcity-1964552-1590305390-19-n5cpu4 --oneshot --ignore-empty-nodes: exit status 1 5: 4414
		3: 4245
		2: 4238
		4: dead
		1: 4528
		Error: UNCLASSIFIED_PROBLEM: 4: dead
		(1) UNCLASSIFIED_PROBLEM
		Wraps: (2) attached stack trace
		  | main.glob..func13
		  | 	/home/agent/work/.go/src/github.com/cockroachdb/cockroach/pkg/cmd/roachprod/main.go:1129
		  | main.wrap.func1
		  | 	/home/agent/work/.go/src/github.com/cockroachdb/cockroach/pkg/cmd/roachprod/main.go:272
		  | github.com/cockroachdb/cockroach/vendor/github.com/spf13/cobra.(*Command).execute
		  | 	/home/agent/work/.go/src/github.com/cockroachdb/cockroach/vendor/github.com/spf13/cobra/command.go:766
		  | github.com/cockroachdb/cockroach/vendor/github.com/spf13/cobra.(*Command).ExecuteC
		  | 	/home/agent/work/.go/src/github.com/cockroachdb/cockroach/vendor/github.com/spf13/cobra/command.go:852
		  | github.com/cockroachdb/cockroach/vendor/github.com/spf13/cobra.(*Command).Execute
		  | 	/home/agent/work/.go/src/github.com/cockroachdb/cockroach/vendor/github.com/spf13/cobra/command.go:800
		  | main.main
		  | 	/home/agent/work/.go/src/github.com/cockroachdb/cockroach/pkg/cmd/roachprod/main.go:1799
		  | runtime.main
		  | 	/usr/local/go/src/runtime/proc.go:203
		  | runtime.goexit
		  | 	/usr/local/go/src/runtime/asm_amd64.s:1357
		Wraps: (3) 4: dead
		Error types: (1) errors.Unclassified (2) *withstack.withStack (3) *errors.errorString

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Artifacts: /autoupgrade

See this test on roachdash
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[darinpp]

This seems to be related to #47024

[asubiotto]

I'm not sure it is. The issue seems to be that the decommission flag is not recognized?:

ERROR: unknown flag: --decommission