[ci] Update run_chargeback_tests for easier local deployment

Add reasonable defaults for cifmw_openshift_kubeconfig and cifmw_path

Author: elfiesmelfie

ci/run_chargeback_tests.yml

@@ -4,8 +4,8 @@
   gather_facts: no
   ignore_errors: true
   environment:
-    KUBECONFIG: "{{ cifmw_openshift_kubeconfig }}"
-    PATH: "{{ cifmw_path }}"
+    KUBECONFIG: "{{ cifmw_openshift_kubeconfig | default(ansible_env.HOME + '/.kube/config') }}"
+    PATH: "{{ cifmw_path | default(ansible_env.PATH) }}"
   vars_files:
     - vars/osp18_env.yml
   vars: