[Feature:System] Revamp worker setup and fix QEMU

[skara9]

Please check if the PR fulfills these requirements:

• [ ] Tests for the changes have been added/updated (if possible)
• [ ] Documentation has been updated/added if relevant
• [ ] Screenshots are attached to Github PR if visual/UI changes were made

What is the current behavior?

Worker configuration currently fails on QEMU due to lack of support for private networking.

What is the new behavior?

The QEMU plugin has been modified to add support for socket networking. The worker management configuration has been revamped to better accomodate the networking needs of the new QEMU plugin setup.

Testing instructions: See Submitty/submitty.github.io#621