Add semicolon when using command command in Makefile

[tenzen-y]

What this PR does / why we need it:
To avoid the make: command: Command not found error, I have added -v option when using the command command in #1884, although we received the same error message again.

Run go mod download
make: command: Command not found
make: command: Command not found
make: command: Command not found
go generate ./pkg/... ./cmd/...
Generate deepcopy, clientset, listers, informers for the APIs

https://github.com/kubeflow/katib/runs/6736557128?check_suite_focus=true#step:5:10

According to this StackOverflow comment, we need to add a semicolon when using the command command on the Ubuntu machine.

you must have a version of GNU make pre 4.3, that doesn't realize command is a shell built-in. You can force it by adding a semicolon like: $(shell command -v python3;)

https://stackoverflow.com/questions/63286462/gnu-make-check-whether-a-python-module-needs-to-be-installed

After applying this patch, I confirmed that we don't receive the error message in this job.

Run go mod download
go generate ./pkg/... ./cmd/...
Generate deepcopy, clientset, listers, informers for the APIs

/assign @johnugeorge

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

Checklist:

• Docs included if any changes are user facing

[coveralls]

Coverage remained the same at 73.948% when pulling 5f2b501 on tenzen-y:add-semicolon-in-makefile into b9314c6 on kubeflow:master.

[johnugeorge]

Thanks
/lgtm
/approve

[google-oss-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: johnugeorge, tenzen-y

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