Feature Request: Relative paths in config

[lostmsu]

What version of nebula are you using? (nebula -version)

1.9.0

What operating system are you using?

Windows

Describe the Bug

There's no way to specify the location of pki files relative to config file.

This makes nebula -service install -config C:\Path\To\cfg.yml create non-functional service as the service does not inherit current directory and won't start because it can't find pki files.

Logs from affected hosts

Could not load client cert (map[]): unable to read pki.key file .\HOST.key: open .\HOST.key: The system cannot find the file specified.

Config files from affected hosts

pki:
  key: .\HOST.key
...

[lostmsu]

Related to this issue, nebula -service install -config relative.yml does not work - service fails to start with "Incorrect function" error. So path under -config must be absolute currently.