Template SERVER IP in all occurrences

[Shayan-Ghani]

the server ip is manually set to 192.168.1.15. it's used in vagrant, vault, ansible, boundary , etc.

• create a task in prepare_env role delegated_to controller host (currently localhost), to template it in variable. and generate all the file that this occurs at using ansible template.

• get the value from STACK_SERVER_IP environment variable. Then use Lookup plugin to get the value with ansible.

• update the documentation with the new environment variable