Clean up duplicated, not clear functionality in NetworkElement NBI server
Description
During the PND refactoring, some issues about the NetworkElement Server weren't handled. These need to be adressed/cleaned up:
- duplicated/unclear methods for add
- duplicated/unclear functionality of update method
- naming of SetMneList vs. Add?
- SetChangeList doesn't seem to be used
Edited by Fabian Seidl