Kata config view to lookup kataconfig file

[girikuncoro]

All the config (i.e. zaunUrl endpoint) is stored by default in home directory ~/.katajson, similar to kubectl config view which shows the current context of kubectl CLI read from ~/.kube/config.

It would be nice to have similar functionality in Kata CLI, i.e.

$ kata config view
{"current_login":"<username>","token":{ ... }, "zaunUrl":"http://zaun.katalabs.io"}

[prakashdivyy]

Waiting for review in PR #46