feature: Add cli arg (-b) to return the best next node for VM placement.

[gyptazy]

feature: Add cli arg (-b) to return the best next node for VM placement.

General

• Added cli arg -b to return the next best node for next VM/CT placement. [#8]
• Added convert function to cast all bool alike options from configparser to bools. [#53]
• Added config parser options for future features. [#53]
• Added a config versio schema that must be supported by ProxLB. [#53]
• Improved the underlying code base for future implementations. [#53]

Fixes

Fixes: #8 Fixes: #53