syscall: remove use of IN_KUBERNETES in test
syscall: remove use of IN_KUBERNETES in test

CL 201737 dropped the use of IN_KUBERNETES in tests, but it looks like
it did not catch all occurrences.

For #12815
For #34956

Change-Id: I72b89bfb850ba2890e9e6aa39b87167291ab7e9f
Reviewed-on: https://go-review.googlesource.com/c/go/+/349789
Trust: Tobias Klauser <0a68dd4915066ec5d3f81f75a828fee53dcc8822@gmail.com>
Run-TryBot: Tobias Klauser <0a68dd4915066ec5d3f81f75a828fee53dcc8822@gmail.com>
TryBot-Result: Go Bot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>
Reviewed-by: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>

CAFxX/go,golang/go,CAFxX/go,nawawi/go,cloudflare/go,cloudflare/go,cloudflare/go,nawawi/go,cloudflare/go,golang/go,cloudflare/go,CAFxX/go,golang/go,cloudflare/go,CAFxX/go,nawawi/go,golang/go,golang/go,cloudflare/go,CAFxX/go,CAFxX/go,golang/go,nawawi/go,CAFxX/go,nawawi/go,CAFxX/go,cloudflare/go,nawawi/go,nawawi/go,golang/go,golang/go,nawawi/go