glooctl install and uninstall print more informative user messages, log other stuff

[rickducott]

Install library can generate a substantial amount of output. This now gets written to ~/.gloo/debug.log. Concise user output is now printed for install and uninstall.

[rickducott]

[16:42:32] rick@Ricks-MacBook-Pro-2:~/code/src/github.com/solo-io/gloo$ _output/glooctl install gateway --file _output/helm/charts/gloo-0.13.2.tgz
Starting Gloo installation...
Installing CRDs...
Preparing namespace and other pre-install tasks...
Installing...

Gloo was successfully installed!

[16:42:50] rick@Ricks-MacBook-Pro-2:~/code/src/github.com/solo-io/gloo$ _output/glooctl uninstall --all
Uninstalling Gloo...
Removing namespace gloo-system...
Removing Gloo CRDs...
Removing Gloo RBAC configuration...

Gloo was successfully uninstalled.