Cleanup code and address @BarbarossaTM pull request remarks

- Remove Makefile for adding it later in a seperate PR
- Remove main files which where added by accident
- Add constants for IPv4 and IPv6
- Improve log messages
- Simplify netlink_reader addPathsToClients and removePathsFromClients
- Refactor Route's Equal function
- Return false for ECMP in netlink_path since ecmp is currently not
implemented in netlink