fix: toolbox: add freebsd stub for fileExtendedInfoFormat

[dougm]

Fixes #3620

[dougm]

@asxe can you try with these changes? I'm not setup with a freebsd system currently.

[asxe]

Looks good, TestProcessCommand is skipped. But next TestProcessKill is failing with the same error. Shall it be another PR?

=== RUN TestProcessCommand
process_test.go:86: exec: "/bin/bash": stat /bin/bash: no such file or directory
--- SKIP: TestProcessCommand (0.00s)
=== RUN TestProcessKill
process_test.go:155: exec: "/bin/bash": stat /bin/bash: no such file or directory
--- FAIL: TestProcessKill (0.00s)

[asxe]

@dougm,
Also, TestProcessIO is failing with 'exec: no command'. Probably, the same /bin/bash dependency.

=== RUN TestProcessIO
process_test.go:250: exec: no command
--- FAIL: TestProcessIO (0.00s)

[asxe]

all the places where "/bin/bash" hardcoded and not skipped.
Bash is available on FreeBSD as /usr/local/bin/bash if installed.

work/github.com/vmware/[email protected]/guest/toolbox/client.go
work/github.com/vmware/[email protected]/toolbox/process/process_test.go:

[dougm]

Thanks for testing @asxe , let's use this same PR to get all the tests passing on FreeBSD. Updated to just skip the toolbox/process tests unless OS is linux or darwin. Not expecting this package to get used elsewhere anyhow.
Please update if you're able to try the current branch, would like to get tests passing on FreeBSD before the next govmomi release.

[akutz]

Thanks @dougm !