fix: updating script to track offline installations

[bejjrajesh]

Proposed changes

This MR contains below two changes

1. It will send a request to pkgs.nginx.com for tracking how many online/offline installs are done using the script.
2. It will support generating the fqdn name for generating nim certificates.

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[mjang]

Approval / merge pending testing (WiP)

[mjang]

Approving based on review of developer test.