Split slurm-llnl into 3 binary packages

All daemons have been removed from slurm-llnl binary package. Here is
the new distribution of packages:
  - slurm-llnl with all client side commands
  - slurm-llnl-slurmd with slurmd daemon
  - slurm-llnl-slurmctld with slurmctld daemon
Remove perl bs file since empty and not installed
Add native support of systemd

This notably means introduction of native service files for all slurm
daemons.
Enable parallel build
Moved examples in dedicated subdirectory
Adds examples for cgroup configuration in slurmd

2 new examples have been added in slurmd package:

- cgroup.conf: configuration file needed for all plugins that uses
  Linux cgroups. This is a direct copy of etc/cgroup.conf from orig
  tarball without modification.
- cgroup.release_common: release script to cleanup cgroup FS when they
  are empty. Based on etc/cgroup.release_common.example for orig
  tarball but with few fixes from next upstream release and proper
  debian sysconfir.
Remove useless file

Probably a remain from a transient package.
Use globing in libslurm-dev.manpages

It may be usefull to match any future manpage with next upstream
releases.
Update paths in all doc and examples references
Add patch to increase size of sacctmgr read buffer
New Debian version 14.03.7-0.1