slurm: new version, system configuration path (#15466)

* Add version 18-08-9-1
* Add variant to allow setting the sysconfdir: See below

About sysconfdir:

slurm has a server and a client.
To use the correct communication channel, the client needs
to be able to read the correct config.  This config is in
PREFIX/etc.

Let's assume one has the server part installed as a system
package.  This generally is a good idea, so that the server
gets started during boot.  This means, that the config is
in /etc/slurm.

If one now wants to use the client part (library!) via
spack, one has a problem: spack's slurm looks in
SPACK-PACKAGE-PREFIX/etc for the config.

There needs to be a way to let the spack installed package
use the system's config.

So add a variant to override the path during build:
sysconfdir=/etc/slurm.

This is much like what happened in #15307 for munge.

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