allow private base without key ref or with extra comment

[asiyani]

following config is now allowed, if only 1 key is used for all private repo then there is no need to reference that key

  - github.com/org/open1//manifests/lab-foo?ref=master
  - ssh://github.com/org/repo3//manifests/lab-zoo?ref=dev

plugin will pick correct key sshKeyB from following config

  # some-extra comment : key_b argocd-voodoobox-plugin: sshKeyB
  - ssh://sshKeyB_gitlab_io/org/repo2//manifests/lab-bar?ref=main