enhance: Handle unix prefix on scheme

[LaurenceJJones]

Fix: #44

Since we use the same apic as CrowdSec the support already existed, we just need to handle when a user supplies "unix:/path/to/file" simply we just set the scheme to be an empty string.

[mk12]

Any update on this? I would love to use Unix domain sockets for crowdsec like I do for all my other services. Not for performance but because /run/crowdsec.sock is way easier to remember than some arbitrary port number, and I can enforce whatever permissions I like on the socket file.