Add multiple improvements at SLURM, config and vrp, and fix a test bug

Add multiple improvements at SLURM, config and vrp, and fix a test bug

- Fix bug at client_test, the module wasn't updated with several changes from other commits.
- Add common function to load data from a file or directory, use this for TAL and SLURM locations (both configurations can have a file path or a dir path).
- Update some config parameters:
+   'server.slurm.location' renamed to 'slurm' and it can be a file path or a directory path.
+   'server.queue' renamed to 'server.backlog' with a default value of SOMAXCONN.
+   Delete 'server.rtr-interval.*' (RTRv1 isn't supported yet).
- Create macros to compare VRPs and to compare each of its properties.
- If the SLURM has errors, don't drop the whole ROA tree, just don't apply SLURM on the tree.