Avoid crash with empty resolv.conf

[siretart]

Fixes: #417
Signed-off-by: Reinhard Tartler [email protected]

[cfergeau]

There is also this lint failure to fix:

cd tools && GOBIN="/home/runner/work/gvisor-tap-vsock/gvisor-tap-vsock/tools/bin" go install github.com/golangci/golangci-lint/cmd/golangci-lint
"/home/runner/work/gvisor-tap-vsock/gvisor-tap-vsock/tools/bin"/golangci-lint run
pkg/services/dns/dns_config_unix.go:6: File is not `goimports`-ed (goimports)
	"errors"
make: *** [Makefile:49: lint] Error 1

[cfergeau]

/lgtm
/approve

[openshift-ci]

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