[Bug] Behavior when getting a user from Nexus API is still not correct (in case of multiple user authen sources)

[manhtukhang]

Bug

As in PR #56, @marcelobartsch changed the API request to get userId directly. But in case of multiple authen sources (with LDAP) and two or more users (from different sources) have same userId, picking the first matched user from received list sometimes is not correct

How to reproduce

• Create 2 or more users with the same userId in different authen-sources
• Call SecurityUserService.Get()

Suggest changes

• method SecurityUserService.Get() should receive a source input arg (default/LDAP/...) to matching exactly