Use passed in credentials to deploy instead of getting the local kube config

[lholmquist]

The openshiftt Rest client already has the ability to specify a username/password/api server url combo instead of using the default ~/.kube/config file.

This PR adds the ability to now pass those options in through the cli and API

New options added:

username, password , apiServer and insecure.

Since this flow doesn't get any existing kube configs that might be local, it will not get the current namespace/project that a user might be on. So by default it will just use the default namespace, but by using the namespace flag, it can easily be changed.

If using Code Ready Containers(CRC), the cli command might look something like this:

$ nodeshift --apiServer https://api.crc.testing:6443 --username developer --password developer --insecure --namespace.name nodejs-examples

Still need to add tests and update the readme as well as not hard code the insecureTLSVerify variable for self-signed certs

[coveralls]

Coverage increased (+0.01%) to 98.626% when pulling 0fb393b on lholmquist:NODE-885-login-with-creds into 9027eea on nodeshift:master.