IsEnterprise currently returns `true` when `IsTenancy` returns true. We
prefer that this behavior is orthogonal. This commit adds failing tests to
the instances where IsEnterprise should not behave the same as IsTenancy.
These test cases are expected to pass with the inclusion of the coming
improvements to go-gh to handle the orthogonality of IsEnterprise and
IsTenancy.
Use `HOSTNAME/gist/ID` instead of `gist.HOSTNAME/ID` as clone URL for
Enterprise since it's not guaranteed that the `gist.` subdomain is
configured for a GHE instance.
We used to do the equivalent of `rootCmd.SetOut(os.Stdout)` because we
thought that Cobra's "Out" stream represents standard output. However,
upon closer inspection it turns out that this is Cobra's stream for
usage errors and deprecation warnings, and those we want written to
stderr as well. It is not clear to me why Cobra maintains a distinction
between "Out" and "Err" streams since both seem to go to sdterr by
default.
This change also ceases our usage of `command.Print()` functions in
favor of explicitly writing to `IOStreams.Out/ErrOut`.
