fix get_current_namespace

[carsonmh]

Issue link

closes #289

What changes have been made

• get_current_namespace checks both serviceaccount and kubeconfig for current namespace. Removed api_config_handler check because sometimes you have api_client but want to check kubeconfig instead of serviceaccount.

Verification steps

• Try logging in with TokenAuthentication after calling oc logout and call get_current_namespace. This will give you your current namespace. If you do this on the old get_current_namespace it will say namespace not found.

Checks

• I've made sure the tests are passing.
• Testing Strategy
  • Unit tests
  • Manual tests
  • Testing is not required for this change

[openshift-ci]

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