Support for LDAP as an authentication source

[baoyachi]

just like this link:https://www.jfrog.com/confluence/display/JFROG/LDAP

[Hirevo]

I personally never interacted with LDAP before, and I don't know how any of it works and how to use it effectively for authentication.
But I take note that bringing support for external sources of authentication in Alexandrie is something that would be beneficial, with support for OAuth having been requested as well.
I'll have to see what I can do to support these things effectively.
Thank you for filing the issue !