[SUGGESTION] Consider renaming to "AzureGuestAgent" or similar

Hi,

On a Linux system, it's a little strange to have a program called "Linux agent"; from the point of view of a Linux user, it's an Azure agent. On a FreeBSD or other type of open source Unix-family guest operating system, it doesn't make any sense whatsoever, and even the Microsoft FreeBSD-on-Azure documentation[1] refers to it as "Azure VM Guest Agent" in the text. Please consider renaming it. Thanks!

[1] https://docs.microsoft.com/en-us/azure/virtual-machines/linux/freebsd-intro-on-azure

The issue does not name any source files, tests, or entry points. Start by reviewing repository-wide uses of “Linux agent” and the linked FreeBSD documentation, then determine the scope and naming decision with maintainers; done would require an agreed name and consistent updates wherever the current name is exposed.

Written by the indexing model from the issue text.