VPC region/zone update in destroy.yaml

[KumarGanesanIBM]

Issue:

In VPC Virtual Server Instance destroy ansible playbook, all get info takes default zone us-south. So, if we have a resource in different zone/region, Destroy ansible playbook is getting failed.

Fix:

1. Updated the zone/region in all the places where it is required.
2. According to the example destroy command in the README.md, modified the variable name.

[KumarGanesanIBM]

@Anil-CM Please review the code and let me know if you have comments.
Thanks,
KumarG.