Put spaces around inside of `[ ]` for bash compat
Put spaces around inside of `[ ]` for bash compat

Fixes #835 

Nominally, we support `sh` compatibility, not `bash`, but this change is so trivial we might as well for consistency if nothing else.
projectcalico/calico-cni,projectcalico/calico-cni,projectcalico/calico-cni